226 



caudal swimmerets are asymmetrical and claw-like and have on their dorsal sur- 

 face a pavement of granules. 



The ophthalmic scales, which are conspicuous, are separated by a consider- 

 able interval : the eyestalks are remarkably long and slender. 



The antennular peduncle is long, and the upper antennular flagellum, which 

 is much the longer of the two, is also of considerable length. 



The antennal acicle is of good length, the flagellum is usually ciliated. 



The mouth-parts differ from those of Parapagurus only in the following 

 particulars : in the 1st maxillae the coxopodite is not recedent, in the 2nd 

 maxillae the scaphognathite is obliquely truncated, the falciform exopodite of the 

 1st maxillipeds ends in a flagellum, and the 1st maxillipeds have no epipodite. 

 As in Parapagurus, the external maxillipeds are separated from one another at 

 base. 



The chelipeds are subequal or equal ; their fingers, which move in a horizon- 

 tal plane, are calcareous or corneous at tip. The 2nd and 3rd pairs of thoracic 

 legs are long and end in long stout dactyli : the 4th and 5th pairs are short, the 

 4th pair be.ing simple (non-chelate). 



In the male the 1st 2 abdominal somites have each a pair of uniramous 

 appendages modified for copulation ; in the female the 1st somite alone has a 

 pair of appendages, the 2nd somite having an appendage on one side only: in the 

 female also a membranous lobe springs from one side of the 4th somite to form 

 the outer wall of an egg-pouch. 



The gills are 14 on either side, namely, 5 pairs of arthrobranchs (somites 

 IX-XIII) and 4 pleurobranchs (somites XI-XIV) and are phyllobranchiae. 



9. Pagiiristes puniceus, Henderson. 



Paguristes puniceus, Henderson, Journ. Asiatic Soc. Bengal, Vol. LXV. pt. 2, 1896, p. 527. 

 ILLUSTBATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CKUSTACEA, PLATE XXXII. FIG. 1. 



" The median frontal projection is less prominent than usual in the genus, 

 and varies considerably in length in different individuals ; in some specimens the 

 apex is subobtuse, and scarcely reaches the base of the ophthalmic scales, whereas 

 in others it is acute, and extends almost to the middle of the scales. The 

 lateral frontal projections are almost as prominent as the median one. The 

 anterior surface of the carapace is somewhat rugose, with a few scattered hairs, 

 and there is a marginal sulcus following the contour of the anterior margin. On 

 the posterior membranous region of the carapace, the median or cardiac area is 

 reduced to a linear elevation, bounded by a sulcus on either side, and the two 

 branchial areas thus almost meet in the middle line. This cardiac elevation 

 widens out slightly in front immediately behind the cervical groove. The eye- 

 stalks are shorter than usual in the genus, just reaching the end of the antennal 



