280 Major A. Alcock and Capt. A. R. S. Anderson on 



Haliporus, Spence Bate. 



Haliporus taprobanensis, sp. n. 



This species appears to be nearly allied to Haliporus ihetis, 

 Faxon. The carapace is leathery, with deep cervical and 

 longitudinal grooves. The dorsal carina is thrice interrupted 

 in its course— by the cervical groove, by a broad shallow 

 groove about midway between the cervical groove and the 

 posterior margin of the carapace, and again close to the hinder 

 margin of the carapace. Here the carina ends as a small 

 tubercle separated from the posterior margin by the dorsal 

 extremity of the longitudinal groove; in front of the cervical 

 groove the carina is very prominent, armed with four teeth, 

 and produced into a short slightly upraised rostrum, fringed 

 below with long hairs. The rostrum, which appears to have 

 been broken and imperfectly repaired, reaches just beyond 

 the end of the cornea, ends in a sharp straight point, and is 

 armed above with two small teeth near its base ; succeeding 

 these is a pair of minute teeth at the same level, one on each 

 side of the rostrum, and beyond these a couple of sinuosities. 

 The first antennal tooth is separated from the tooth behind 

 it by a groove running obliquely downwards and backwards 

 from the level of the eye-stalk. On the posterior margin of 

 the cervical groove is a well-marked sharp tooth, continued 

 posteriorly into an elevated rounded ridge, running backwards 

 parallel to and at a little distance from the longitudinal 

 groove. The branchiostegal tooth, situated at the lower end 

 of the frontal margin, is not so minute as in Haliporus thetis, 

 and is continued backwards as an elevated ridge to the 

 posterior margin of the carapace. 



The abdomen is compressed and throughout carinate 

 dorsally. The first, second, and third segments are marked 

 by a deep transverse groove separating an anterior smooth 

 articular from a posterior part of each segment. In the first 

 segment the articular portion is nearly as long as the part 

 behind the groove, the posterior half alone of which is 

 elevated into a carina. In the second and third segments the 

 articular portion forms only about £ of the total length of the 

 segment, and the entire part behind the groove is carinate. 

 The fourth, fifth, and sixth segments are carinate throughout 

 their entire length. The carina is grooved in its centre and 

 produced into a small sharp tooth at the posterior extremities 

 of the fourth, fifth, and sixth segments; the posterior dorsal 

 central margin of the second, third, fourth, and fifth segments 

 is slightly notched V-wise. The transverse grooves on the 



