1 74 Transactions. — Zoology. 



from Aora typica, is, however, so very like Microdentopus maculatus in every 

 part except the gnathopoda that I have httle doubt that it, and not Aora 

 typica, is really the male. This is also confirmed by the fact that the two 

 were found together. 



DESCKIPTION OF PLATE VHI. 

 Fig. 1. Hymenicus marmoratus. 



a. Third (external) maxillipede x 22. 



b. Second maxillipede x 22. 



c. Abdomen of male x 5. 

 Fig. 2. Antliura (?) Jiagellata. 



a. Antennffi x 22. 



b. Third thoracic leg x 22. 



c. Sixth thoracic leg x 22. 



d. Abdomen and telson x 22. 

 Fig, 3. Microdentopus maculatus. 



a. First gnathopod of male x 22. 



b. Second gnathopod of male x 22. 



Aet. XXV. — On some Subterranean Crustacea. By Charles Chilton, B.A. 



[Read before the Philosophical Institute of Canterbury, 3rd November, 1881.] 



Plates IX. and X. 



The existence of blind Amphipodons Crustacea in wells and caves of 

 England and Europe, has been long known ; in this paper I record the 

 existence of similar animals in New Zealand. The Crustacea which form 

 the subject of this paper were obtained from a well at Eyreton, about six 

 miles fi-om Xaiapoi, North Canterbury. The well was made about seven- 

 teen years ago, it is not more than twenty-five feet deep, and it is fitted 

 with a common suction pump, through the medium of which these interest- 

 ing animals were obtained. 



From this well I got three species of Amphipoda and one of Isopoda. 

 In none of these have I seen any trace of eyes, though I have examined 

 living as well as preserved specimens. The most interesting species is the 

 Isopod ; the only other blind Isopod inhabiting wells or caves that I know 

 of is the genus CcBcidolea, a species of which is found in the Mammoth Cave 

 of Kentucky, and another in the Wyandotte Cave.* 



* See " Nature," 1872, pp. 11, 445, and 484. 



