223 



' The gills are similar to those of P. andersoni, but the lamellae are narrower. 

 The eggs are moderately large, and the oviducal opening of the female is, as 

 usual in the genus, present only on the left side. 



* The largest specimen is a female with ova, which measures as follows :— 

 Length of body ... ... ... 16 mm. 



„ carapace ... ... ... 5*5 „ 



„ „ right chelipede ... ... 10'5 „ 



„ „ first right leg ... ... ... 16 „ 



Arabian Sea, off the N. Maldive Atoll, 719 fathoms. 



Inhabiting shells of Dentalium. One of the shells is encrusted with a colony 

 of Epizoanthus. 



Eegd. Nos. ~ : — "'™- (Types of the species). 



Sympagurps, S. I. Smith. 



Sympaguruf, S. I. Smith, Froc U. S. Nat. Mus. VI. 1883 (1884). p. 37 : Henderson, Chaltenger Anouuira, 

 p. 52 : A. Milne Edwards and E. L. Bouvier, Mem. Mus. Comp. Zool. XIV. No 3, 1893, p. 58. 



Differs from Parapagurus only in the fact that the gill-elements instead of 

 being arranged in a double row on either side of a stem (quadriserial) are in a 

 single row on either side of a stem (biserial) like phyllobranchiaa. The gills, 

 however, differ from ordinary phyllobranchiee by reason of the narrowness of 

 the individual gill-plates. Their number and disposition is the same as in 

 Parapagnriis, namely 11 on either side— a pair of arthrobranchiae to every 

 somite from the IXth to the XHIth, and a single pleurobranch on the XHIth. 



The mouth-parts resemble those of Parapagurus, the exopodite of the 1st 

 maxillipeds having no flagellum. 



The other appendages of the body resemble those of Parapacjurm except 

 that, in the Indian species, the eye-stalks are shorter and wider and the eyes 

 more dilated, and the antennal acicle is not so long. 



6. Sympagurus monstrosus (Alcock). 



? Piirapagnrua monstrosus, Alcock, Ann. Mag. Nat. Hist., March 1894, p. 243. 



Sympagunu monstrosus, Henderson, Journ. Asiatic Soc. Bengal, Vol. LXV. pt. 2. 1896. p. 533. 



Illustrations of the Zoology of the Investigator, Crustacea, Plate XXXII, Fig. 4. 



The well-calcified anterior portion of the carapace is convex, smooth, and 

 polished, with the gastric region and the hepatic regions sharply circumscribed 

 by deep incisions ; the frontal margin is sinuous and the rostral projection, which 

 is carinated, is inconspicuous ; the posterior portion of the carapace is extremely 

 thin, but is quite appreciably and uniformly calcified ; its surface is smooth and 

 bears some long scattered hairs. 



