Records of the Indian Museum. 



[Vol. VI, 



would suggest and the ring of attachment less near the centre. 

 These apparent differences are perhaps due to shrinkage effected 

 post mortem. The two specimens were attached to the abdomen 

 of a specimen of Munida microps Alcock from the Bay of Bengal 

 (480 fathoms). This rare parasite appears to confine itself to 

 Macrura of the genus Munida (Galatheidae) and has hitherto been 

 found ^ only in the Atlantic and North Sea. 



SesarmaxEnos, gen. nov. 



Rhizocephala with a slug-like or sausage-shaped body the 

 main axis of 'which lies across the longitudinal axis of the host, the 

 body as a whole being compressed between the ventral surface of 



Fxo. I -Type specimen _ofS.-^^^^^ l^^ 1.^^^ 



B = point of attachment; ^ - (•) ^^,^''^''^. X^of host • F = base of abdomen 

 between ovaries; E = bases of ambulatory li^^s ^t hos^^^^ ^ carapace of host; 

 (which has been removed) of host ; G = ventral surface ot carapac 

 H = longitudinal muscles of parasite. 



the carapace and the retroverted abdomen of the ^^^st w-hich in 

 the case of the only known specimen is a Grapsid crab from fresh 

 water. The parasite is attached to the ventral surface of the 

 crab's carapace by means of a chitinous rmg apparently without 

 roots the'Jing bdng situated in the middle of the njargin of the 

 parasite most remote from the anterior margm «[ ^^^ ^°^\.^ 

 carapace. There are two slit-like orifices m the mantle , they aie 

 surrounded and separated by a stout muscle, strands from which 

 run along both surfaces of the body. The visceral mass is apparent^ 

 attached to the mantle by a mesentery that surrounds the rmg ot 

 attachment, being surrounded at all other points by a capacious 

 brood-pouch, which contains larvae of the cyimdjtype^^ine 



1 See G. Smith, "Rhizocephala," Faun. u. Flor. Golfes v ^f^/^^' P^^'^ 

 (,9o6)Tand Guerin-Ganivet.BM^ Inst. Ocianogvaphique (Monaco), No. 189 (1910). 



