68 A Guide to the Zoological Collections in the 



The following families are illustrated in the Gallery : — 



1st Family, Crangonidse, Shrimps : the single genus 

 Crangon is found in Indian Seas on sandy 

 bottoms and in deep water. Two species of 

 Indian Shrimps are exhibited. 



2nd Family, Glyphocrangonidae : the genus Glypho- 

 crangon is commonly dredged in the Bay of 

 Bengal and Andaman Sea at depths of about 

 200 fathoms. In the beautiful specimens ex- 

 hibited notice the huge eyes which seem to be 

 specially developed to catch the very small 

 amount of sunlight that penetrates to the depth 

 at which theise animals live, just like the large 

 eyes of owls and other twilight-loving animals. 



3rd Family, Alpheldse: two genera Alpheus and 

 Athanas occur in Indian waters. Alpheus is 

 exceedingly common in the reefs of the Anda- 

 man and Laccadive Islands, living usually in 

 pairs, male and female, in crannies in the rocks, 

 in the cavities of sponges, corals, etc. 



4th Family, Psalidopodidae : one genus Psalidopushz.'s. 

 been dredged in the Andaman Sea at depths of 

 400 to 500 fathoms. To this great depth no 

 sunlight can penetrate, and it is not surprising 

 therefore to find that Psalidopus has the eyes 

 reduced to mere rudiments. The first pair of 

 thoracic legs is peculiar in ending, not in 

 pincers, but in two blades, which cut across 

 each other like scissors. 



5th Family, Hippolytidse. To illustrate this family 

 specimens of the genus Hippolyte are shown, 

 being the only form that occurs in the Seas of 

 India. 



6th Family, Pandalidae. Fine specimens of the genera 

 Pandalus, Dorodotes, and Heterocarpiis, all 

 from the depths of the Indian Seas, are exhibit- 

 ed. Heterocarpus is highly luminous. 



