290 Major A. Alcock and Capt. A. B. S. Anderson on 



From tip of rostrum to end of telson they vary from 119 to 

 74 millim. 



All our specimens show the distinctive peculiarities not of 

 Faxon's Pacific variety, but of the typical Atlantic species. 

 In shape and general appearance they resemble Pentacheles 

 phosphorus, but can at once be distinguished from this by 

 having two instead of one spine on the outer side of the basal 

 antennulary joint, by being armed with one spine instead of 

 two between the rostral spines and the pair of spines about 

 the centre of the gastric area, by having no spines on the 

 carapace posterior to the cervical groove and between the 

 median carina and the sublateral carina, and by the presence 

 of a procumbent spine on the first five instead of the first 

 four abdominal segments. 



New to the Indian fauna. 



Eryonicus, Spence Bate. 



Eryonicus indicus, sp. n. 



Closely resembling Eryonicus emeus, Bate (Faxon), from 

 which it differs in the following particulars : — the dorsal 

 median spines are arranged thus — 2 (rostral), 1, 1, 2, 1, 1, 

 2, 2, 1, 2 ; the anterior three groups of spines, exclusive of 

 the rostral, are considerably larger than those figured by 

 Faxon ; behind the orbit there are but three spinules on the 

 gastric region ; the branchial ridge bears 7, not 5 spinules ; 

 the last spine on the lateral carina is by far the largest of all 

 those on the animal ; the 5 large spines on the lower of the 

 two ridges below the lateral carina are considerably smaller 

 than the last spine of the lateral carina, show no regular 

 diminution in size from the first to the last (indeed, the 

 middle one is the longest), and are both followed and preceded 

 by a row of denticles on the ridge; the dorsal row of spines 

 on the abdomen consists of one spine on the first, second, 

 fifth, and sixth segments and two spines on the third and 

 fourth segments, the spines of each pair being united by a 

 connecting longitudinal ridge, and the posterior spine of each 

 pair much exceeding the anterior in length ; on the proximal 

 end of the telson is one spine ; only about the inner half of 

 the orbit is filled by the eye-stalk, between which and the 

 outer orbital margin is a wide gap crossed anteriorly by a 

 conical process of the eye-stalk, similar to that of Eryonicus 

 ccecus, which, however, does not quite reach the outer margin 

 of the orbit ; the basal joint of the first antenna ends in a 

 long internal and a short external spine, and is not fringed 



