REPORT ON THE AMPHIPODA. 1391 



Edwards says of his " Lestrigonus Fabreii," "long d'environ cinq lignes," a very 

 considerable difference, seeing that he also was describing an adult male, besides that 

 in Milne-Edwards' species only the first two segments of the perason are coalesced. 

 From Dana's species from the Sooloo Sea the Challenger one is distinguished by the 

 fifth perasopods, which are decidedly shorter than the fourth, whereas in Dana's species 

 they are both figured and specially described as being longer ; in our species, moreover, 

 the postero-lateral angles of the first three pleon-segments are squared, not rounded. 

 The immature male and the female of "Lestrigonus bengalensis" Giles, 1887, show the 

 peculiarity of having the first five segments of the perseon indistinctly divided or 

 dorsally quite coalesced, but in that species the peduncles of the second uropods extend 

 beyond those of the other two pairs, and the telson is figured as much wider than 

 long. 



Hyperia schizogeneios, n. sp. (PI. CLXVIIL). 



Tlie Head much deeper than long, with a widely emarginate process, forming a sort 

 of divided chin below the insertion of the lower antennae ; the peraeon narrowing 

 distally, but deeper throughout than the pleon, also much wider than the pleon, 

 especially at the centre, the preponderance of the front over the hinder part of the 

 animal giving it a top-heavy appearance ; the first three or sometimes four segments 

 of the perseon dorsally coalesced ; the postero-lateral angles of the first three segments 

 of the pleon squared, or the first almost rounded. The young while still in the egg, 

 without indication of limbs, show the same preponderance of the front over the hinder 

 part of the animal as the adult. 



The Eyes occupying the whole surface of the sides of the head. 



U-pper Antennae. — In the largest male specimen the peduncle has the usual three 

 joints, and the flagellum has the usual large tapering first joint, which is followed by 

 about twenty-three short joints, several of which are nearly as broad as long, the 

 linear stage not having been reached. In the female the peduncle consists of a single 

 joint, followed by a strongly tapering flagellum, also consisting of a single joint, very 

 much longer than the peduncle, with four long filaments or pairs of filaments in a series 

 on the inner side of the upper and thicker part. 



Lower Antenna;. — In the male the last joint of the peduncle the longest, the 

 flagellum similar to that of the upper antennae, except that the first joint is not bulky, 

 though nearly as long as the last joint of the peduncle, followed by twenty-one 

 short joints, the last tapering to a point. In the female the peduncle consists of a 

 short broad joint, and the flagellum of one scarcely longer, strongly tapering to an 

 acute apex. 



The Month-Organs of the female are shown in situ at the lower right-hand corner of 



