The Inconspicious Penis
This article discusses the several varieties of "buried" penis (usually a complication of circumcision).
www.cirp.org/library/complications/bergeson/   reviews

EMedicine - Microphallus : Article by Michael J Bourgeois, MD
Microphallus - Microphallus, or micropenis, is defined as a morphologically normal penis, including a penile urethra, with a stretched length less than 2 standard deviations (SDs) below the mean for age. The average stretched penile lengths in preterm (30 weeks gestation) and term infants are 2.5 cm 0.4 cm, and 3.5 cm 0.4 cm, respectively. Tuladhar et al developed the following formula to ...
www.emedicine.com/PED/topic1448.htm   reviews