REPORT ON THE CRUSTACEA MACRURA. 587 



The pleopoda are of generic value, only the posterior pair having the rami subequal, 

 and about one-third longer than the telson. 



Observations. — Dr. Stimpson 1 describes a species under the name of Latreutes 

 dorsal is, which is armed with two teeth on the dorsal surface of the carapace, of 

 which the anterior is spiniform and directed anteriorly, and the other obtuse and nearly 

 obsolete. His species was taken in the Gulf of Hakodadi, Japan, where it is common 

 on shelly bottoms at a depth of 8 fathoms. He describes its colour as being a brilliant 

 scarlet (" coccineus "), and having a white dorsal band. 



Hippolyte, Leach. 



Hippolyte, Leach, Trans. Linn. Soc. Lond., vol. ix. p. 346 ; Edin. Eucy., vol. viii. p. 432, 

 1815; Ency. Brit., Supp. 1, p. 421 j Mai. Pod. Brit., tab. xxxviii., 1815-17. 

 „ Milne-Edwards, Hist. Nat. Crust., t. ii. p. 370. 



Verbius, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 104, 1860. 



„ Heller, Crust, siid. Europ., p. 284, 1863. 

 Hippolyte, Kinahan, Proc. Nat. Hist. Soc. Dublin, p. 47, figs. 1-6, 1867. 

 Verbitis, Miers, Cat. Stalk-Eyed Crust, of New Zealand, p. 81, 1876. 

 Kingsley, Proc. Acad. Nat. Sci. Philad., p. 421, 1879. 

 Sars, Forhandl. Vidensk. Selsk., No. IS, p. 7, 1882. 



Carapace anteriorly carinated and produced into a laterally compressed rostrum, 

 the upper margin of which is parallel with the dorsal surface of the carapace and armed 

 with teeth ; the under margin is excavated at the base and serrate towards the 

 extremity. The fronto -lateral surface is armed on each side with a supraorbital and an 

 antennal tooth. Pleon smooth, third somite posteriorly produced in the median dorsal 

 line, and somewhat arcuate. Telson dorsally flat, laterally compressed, posteriorly 

 tapering, and furnished with two solitary spines on each side, longitudinally situated on 

 the dorso-lateral surface. 



The ophthalmopoda are short, uniarticulate and pyriform. 



The first pair of antennse has the first joint of the peduncle excavate, and armed 

 with a sharp stylocerite that is subequal with it in length. The second and third 

 joints are smaller and subcylindrical, the terminal supporting two short flagella, of 

 which the outer is the shorter and more robust. 



The second pair of antennae carries a terminally ovate scaphocerite that is distally 

 armed with a tooth on the outer margin, and a flagellum that is subequal with the 

 length of the animal. 



The second pair of gnathopoda carries a short basecphysis, and terminates in a joint 

 that is distally truncate and furnished with small spinules. 



The first pair of pereiopoda is short, stout and chelate ; the carpos is triangulate 



1 Proc. Acad. Nat. Sci. Philad., January 1860, p. 96. 



