450 ME. J. E. HENDEESON — A OONTEIBUTION 



275. Pen^us brevicornis, Milue-Edw. 



P. brevicornis, Milne-Edwards, Hist. Nat. Crust, t. ii. p. 417 (1837). 



P. avirostris, Dana, Crust. U.S. Explor. Exped. pt. i. p. 603, pi. xl. fig. 3 (1852). 



Kvirachi, two specimens [Bi^it. Mm.) ; Calcutta, one specimen {Day). 



The rostrum is short, only slightly exceeding the eyes, with the dental formula ^ ;. 



the distal half is styliform and unarmed, while the proximal half is slightly elevated above 

 the level of the apical portion ; the two proximal teeth are separated by a wider interval 

 than any of the others. The antennular flagella are about equal in length to the 

 peduncle. The hepatic spine is minute. The first three pairs of legs are unispiuose at 

 the base, while the fifth legs in the male are slender, with a proximal notch and ridge. 

 The fourth, fifth, and sixth abdominal segments are carinated. 



The specimens appear to belong to Dana's species, with which they closely agree, and 

 they are probably also referable to Milne-Edwards 's P. brevicornis. P. Lysianassa, De 

 Man, from Mergui, is an allied species, but distinguished by its much shorter rostrum, 

 which is also more elevated ; the petasma has a different form, and the fifth leg in the 

 male is not only notched, but provided with a hooked process. 



Distribution. Indian Seas {Mihie-JEchcards) ; Mauritius (Pie/;^ers) ; Singapore (/>«««) ; 

 Borneo [Miers). 



276. PENiEUS CANALicuLATUS, Olivier. 



P. canaliculatiis (Oliv.), Bate, 'Challenger' Macrura, p. 24o, pi. xxxi., pi. xxxii. fig. I, pi. xxxvii. 

 fig. 2 (1888). 



Gulf of Martaban, a single specimen (Oates). 



The rostrum is slightly curved, and with the dental formula y (in the species generally 



9— 1"^ 

 it is -J—"); posteriorly it is continued to the hind margin of the carapace as a deeply 



sulcate ridge, on eitlier side of which is a well-marked lateral sulcus. The first and 

 second pairs of legs are unispinose at the base. The telson is unarmed, or provided with 

 very minute lateral spinules. P. carmnote, Risso, from the Mediterranean, and P. 

 brasiliensis, Latr., from Eastern America, are closely allied. 



Distribution. From the Red Sea and E. Africa to Japan, Australia, and the Pacific 

 (Tahiti, Fijis). 



277. Pen^us compressipes, n. sp. (PI. XL. figs. 21, 22.) 



Gulf of Martaban, a female (Oates). 



The rostrum is short and straight, only slightly exceeding the eyes, and continued as a 



g 

 faint ridge almost to the hinder margin of the carapace, with the dental formula ^ ; the 



first tooth is placed some distance behind the level of the hepatic spine, almost half-way 

 back on the carapace, and separated by a wide interval from the second, the tliird tooth 

 nearly above the orbit ; the upper teeth are continued to the apex, and the lower margin 

 is ciliated. The eyes are rather small, with slender peduncles. The antennal scales are 



