curved forward-pointing tabular tooth projecting on either side 

 of the carapace from l)et\vocn the hirge and small sub-lateral 

 tables. The sternal plastron has (Icc}) triangular pits opposite the 

 insertions of the legs. Of the pleon the second and third seg- 

 ments are much wider than the others ; the third narrows distally, 

 the sixth distally widening a little. 

 The second antennae do not reach the ends of the rostral horns. 



The chelipeds are very nearly as long as the first ambulatory 

 legs, exceeding in size those of any other species attributed to 

 this genus. The arm has three tuberculate ridges; the short 

 wrist also has three crests; the hand is as long as the carapace 

 rostrum included, by these proportions dififering from other 

 species, the ends of the thumb and finger fit closely together, the 

 inner margin of each being divided into six small teeth ; the basal 

 half of the finger has a small and a large prominence, the cavity 

 between them being filled by a tooth on the thumb, but the cavity 

 beyond the large prominence leaving a gap. In the 

 ambulatory ftet the arm is longer than the hand, and 

 th^^ linger is more than half as long as the hand, with 

 a little smooth nail, but otherwise thickly coated with 

 spines : the rest of the limb, though smoother in ap- 

 pearance, is cIo'^pIv invested with tlie tuberculiform apically 

 pointed cutaneous vesicles described by Sars, wdiich also occur 

 on the pleon, the mouth organs, and various parts of the body- 

 The presence of these remarkable objects is expressly noted for 

 S. carpcntcri and for 5. occidciifalis, and is perhaps intended by 

 the " short felty pubescence '' which Aliers describes as investing 

 Pngcttia I'clutina. It is not specified by Alcock either for that 

 species or for the others which he refers to Scyramathia. 



Length of carapace, 55 mm., breadth. 33 mm., length of rost- 

 rum, 14 mm.; first ambulatory leg more tlian twice as long as the 

 (. arapnce. 



Habitat. A single specimen, male, taken 28 miles off 

 Lion's Head, from a depth of 140 fathoms. 



The discussion of the genus, and the description of the present 

 species with the figure of it were completed before I had had an 

 opportunity of consulting Professor Chun's volume, but on seeing 

 there Doflein's figure of S. Jicrtwigi, though it is unaccompanied 

 by any description, I could not resist the conviction that it repre- 

 sented the very species I had been studying. 



Cycloi^ietop.x. 



FaM. : PoKTl"X[DAK. 



1899. Poriiinidac, Alcock, Journ- Asiat. Soc. Bengal, vol. 68, pt. 

 2, p. 4. 



