28 



Gex.: Pokcellana, Lamarck. 



j8oi. Porcellana, Lamarck, Syst- Aniiii. .sans vcrtcbies, p. 153. 

 JS58. Porcdlana (rcsliicted), Stimpson, Proc. Acad. Sci. Pliilad., 



p- 22^ (6<jj. 

 1886. Ponellaiia, Henderson. Challenger An^nmra, Reports, 

 vol- 2y, p. loy. 

 Henderson, who gives a long list of relerences, supplies the 

 following definition :— '' Carapace suborbicular or subovate, the 

 length usually greater than the breadth. Frontal region promi- 

 nent and dentate, the teeth usually well developed. Eyes of 

 moderate size, the orbits deep. Chelipeds moderately llattened, 

 the carpus short and usually provided with a single projecting 

 lobe near the proximal end of the internal margin ; the digits 

 frequently contorted- Ambulatory limbs with the dactyli short 

 and robust, terminating in a single claw." 



Pokcellana deuaanii, Krauss. 



1843. Porcdlana dchaaiiii, Krauss, Die siidafrik. Crustaceen, p. 



^ 59. pl- 4. fig- -'• . 

 1858- Porcdlana Dchaani, Stimpson, Proc. Acad. Sci- Philad.. p. 



229 (67 j. 

 1858. Porcdlana sirc[>lodidcs. Stimpson, Proc. Acad. Sci- 



Philad., pp. 229 (67), 243 (81). 

 1886. Porcdlana slrcploclides, Plenderson, Challenger Anonuira, 



Reports, vol- 27, p. no. 

 Stimpson distinguishes his species from that of Krauss by its 

 having the carapace bare, the front broader, the median tooth less 

 prominent, and the supcr-antennary margin not denticulate. But 

 according to Henderson " in the Challenger specimens 

 short stout hairs arranged in tufts are noticeable 

 on the ga.stric, cardiac, and bronchial areas." 

 In our specimens there are two conspicuous tufts 

 behind the front on the gastric area, but no others ; the 

 median tooth is uith or without hairs, and a little more prominent 

 than tile other two frontal teeth; below a notch under the second 

 antenna there is a sub-marginal ridge uf four or five little lateral 

 denticles, the lowest but one being slightly the argest. Henderson 

 recognizes that P- sfrcptochdcs is closely allied to P- dchaanii, but 

 observes that in the latter '" the chelipede^s are smooth and the 

 carpi unarmed, the median frontal tooth is conical and prominent, 

 and the antero-lateral nvargin of tlie carapace is denticulate over 

 the insertion of the antennal peduncle." These (lilt'erences. how- 

 ever, may in part be attributed to the state of individual speci- 

 mens and in part to the observer's opinion of what was worth 

 noting. Krauss speaks of the carpus as having the margin entire, 

 while Stimpson speaks of it as smooth, obsoletely 23 dentate on^ 



