110 THE VOYAGE OF H.M.S. CHALLENGER. 



This species iiihalnts the West Indies and the soutliern shores of the United States. 

 It has been previously recorded from St. Thomas by Stimpson. 



Porcellana streptochcles, Stimpson. 



Porcdlana streptochehs, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 81, 1858. 



Habitat. — Simon's Bay, Cape of Good Hope ; depth, 5 to 18 fathoms. Two females 

 with ova, the carapace of the larger measuring only 4'5 mm. in length and 4 "2 mm. in 

 breadth. 



In this species the front is of moderate size, and composed of three acute teeth with 

 denticulate margins, of which the median is deflexed and obscurely tridentate, while the 

 lateral teeth are scarcely less prominent ; the lateral margins of the carapace are also den- 

 ticulate. The ehelipedes are unequal, with the carpi armed by two or three teeth on each 

 lateral margin, of which those on the outer border are minute ; the propodus is granulated 

 above, and bears a median carina, its outer margin is obscurely denticulate. According 

 to Stimpson the carapace is smooth, but in the Challenger specimens short stout hairs 

 arranged in tufts are noticeable on the gastric, cardiac, and branchial areas. Porcellana 

 streptochehs is closely allied to Porcellana dehaanii described by Krauss from the coast 

 of Natal,^ in which, however, the ehelipedes are smooth and the carpi unarmed, the 

 median frontal tooth is conical and prominent, and the antero-lateral margin of the 

 carapace is denticulate over the insertion of the antennal peduncle. 



The type specimens were dredged in Simon's Bay, at a depth of from 6 to 12 

 fathoms. 



Porcellana sei-ratifrons, Stimpson {PI. XI. fig. 5). 



Porcellana seiratifronx, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 80, 1858. 



Habitat. — Hong Kong ; depth, 10 fathoms. An adult male (from which the figures 

 are taken). 



Arafura Sea. A male specimen. 



The types of this species were taken at Hong Kong. The front is composed of 

 three serrated lobes, of which the median is large and rounded, while the two lateral are 

 subacute and scarcely less prominent. The antero-lateral margin of the carapace bears 

 two or three acute spinules immediately over the insertion of the antennal peduncle, and 

 the lateral margin is also provided with from one to three similar processes of slightly 

 larger size. The ehelipedes are smooth and punctate, the inner angle of the merus is 

 jjrominent, and either smooth or armed with from one to two spinules ; the inner margin 



1 Krauss, Sudafrik. Crust,, p. 59, tab. iv. fig. 2, 1843. 



