229 



In the female the appendages of the first abdominal somite form a small 

 symmetrical uniramous pair. Those of the next four somites (2nd-5th) are 

 present on one side only— right or left : the first three of them are slender 

 biramous appendages, of good size, for carrying the eggs, and are contained 

 within a capacious cup-like brood-pouch formed by a membranous lobe that 

 springs from one side of the fifth somite : the fourth of them is a tiny biramous 

 appendage and is not enclosed in the brood-pouch. 



In both sexes the appendages of the sixth somite are symmetrical biramous 

 swimmerets, placed symmetrically on either side of the telson : then rami are 

 slender and falciform. 



The branchial formula is as follows : — 



Artbrobiancbise. 



5 5 3 =13 



Each gill consists of two series of broad leaflets. The leaflets, however, are 

 not quite simple, since each one carries, near the tip, a pair of slender filaments 

 large enough to be seen with the naked eye. 



The single species known does not inhabit a shell, but lives protected by a 

 blanket formed by the soft fleshy coenosarc of a colony of Actiniarian polyps. 



10. Chlamopagiirus andersoni, Alcock. 



ChUenopagwrus andersoni, Alcock, Journ. Asiatic Soc. Bengal, Vol. LXVIII. pt. 2, 1889, p. 115, p l j 

 Illustrations of the Zoology of the Investigator, Crustacea, Plates LIII. Figs. 1, 2 and LIV. Fig. 1 



The cervical groove is deep-cut, and the portion of the carapace that is in- 

 cluded within it is strongly calcified. The triangular cardiac region is also fairly 

 well calcified, especially in its anterior part. But all the rest of the carapace, 

 except here and there along the outer edge of the cervical groove, is quite soft 

 and membranous. The hepatic region is marked off from the branchial region 

 by a transverse furrow. 



The front, which is carinated dorsally and deflexed at tip, projects well 

 between the eye-stalks. 



The eyes are large and reniform and are borne on stout stalks, which are 

 about quarter the length of the carapace measured in the middle line. 



The first two joints of the antennulary peduncle are together about the 

 same length as the eyestalk, the first joint being flattened and somewhat dilated 



