235 



The second abdominal segment consists of a single plate dorsally, which is 

 dimpled on either side of the middle line. 



The abdomen of the male has a slight twist to the right and is nearly 

 symmetrically constituted ; in the female, although it is unsymmetrical, it is no! 

 much more twisted. 



Four specimens, the largest of which has the carapace 39*5 millim. long and 

 37 millim. broad, were taken off the Travancore coast at 430 fathoms. 

 Colours in spirit pale milky orange-pink, eyes intensely black. 

 Regd. No. — 'j^— (Types of the species). 



GALATHEIDBA Henderson. 



Oalntheids, Boas. Vid. Selek. Skr., Raekko, Nat. og. Math. Afd. I. 2. 1880, p. 19S. 



Galatkeidca, Ilendcrson, Challenger Aiimnura, \>. 103, (et tyn.) : Ortmann in Iironn's Thicr Hcich, Malacontraca, 

 p. 1148. 



Qalalhiidit, Milne Edwards and Bouvier, Ann. Sci. N'at. Zool. (7) XVI. 1894, p. 191 et teq., and Mem. Mus. 

 Comp. Zool. XIX. 2. 1897, p. 12, and Grant. Decap. Itirondolle et PrinceHae Alice, Monaco, 1899, p. 70. 



Carapace generally more or less depressed, commonly elongate, sometimes 

 broad and crablike, the front not fused with the epistome : the rostrum is well 

 developed and conceals the ophthalmic somite. Thoracic sternum broad. 



The abdomen is broad well -calcified and symmetrical and ends in a broad 

 symmetrical tail-fan formed of a broad telson and foliaceous caudal swimmerets : 

 it is either folded on itself, or flexed against the thoracic sternum. 



Antennal peduncle often four-jointed (the 2nd and 3rd joints having fused), 

 the 2nd joint only occasionally carries a movable acicle. 



The flagella of the maxillipeds, when present, are flexed inwards, and 

 though in the deep-sea forms the external maxillipeds are generally pediform, in 

 some littoral forms they are opercular. 



The 1st pair of thoracic legs are massive and chelate, the next 3 pairs are 

 all monodactylous and all about equally well developed, the 5th pair, which may 

 be subchelate or minutely chelate, are weak and flexed. 



It is usual but not universal to find, in the male, paired appendages modified 

 for copulation, on the first 2 abdominal somites, and paired appendages (which 

 are commonly more or less rudimentary) on the next 2 or 3 somites, and, in the 

 female, paired appendages on the 2nd— 5th somites. 



Henderson divides the Galalb-i<l>;/. into two groups — the Brachyura-like 

 Pokcellanodka, wliich, in these seas, are, so far as our present knowledge goes, 

 inhabitants of the rocks and reefs of the littoral zone, and the Macrura-like 

 Galatuodea, which are abundantly represented in the depths. 



A. Milne Edwards and Bouvier (Ann. Sci. Nat., Zool., (7) XVI. 1894) 



include all the Oalalheidea in one family, Galatheides, which they subdivide into 



