200 



the dactylus is particularly small and the setae of the propodite particularly 

 abundant. 



The first pair of abdominal appendages (in the female) are short and forked, 

 the outer fork being filiform, the inner being very short, truncate, and ending 

 in a long slender tuft of hairs. The second to fifth pairs inclusive are very 

 broadly lamellar, the expedites and endopodites being nearly equal in size : in 

 every case the inner edge of the endopodite carries, near the middle, a small 

 styliform appendage. 



Colours in life, ivory white with some scattered yellow-ochre flecks. 

 The length of the carapace in the middle line (rostrum included) is 21 

 millim., of the abdomen 44 millim. 



From the Bay of Bengal, off Ceylon, 200-350 fathoms. 



9321 



Eegd. No. -^- (Type of the species). 



116. Cdlllanassa lignicola, Alcock and Anderson. 



Callianassa lignicola, Alcock and Anderson, Ann. Mag. Nat. Hist., April 1899, p. 288. 

 ILLUSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE XLII. FIG. 2. 



Carapace a little less than a third the length of the abdomen, the middle of 

 the segments into which it is longitudinally divided non-carinate : rostrum 

 minute, just projecting between the basis of the eyestalks. 



No two abdominal terga are alike in length and breadth, but they do not 

 differ much otherwise ; none of them have any lateral (pleural) spines ; the 2nd 

 is by far the longest. The telson, which is quadrangular with the sides conver- 

 gent, is much shorter than the 6th tergum and shorter than the caudal-swim- 

 merets, which are broadly foliaceous. 



Eyes small, but very black and distinct. The antennular peduncle, of 

 which the 3rd joint is longer than the first two combined, is longer than the 

 autennular flagella, these being less than a third the length of the carapace. 



External maxillipeds distinctly opercular, the ischium and merus being 

 broad and quadrangular. 



In the large cheliped of the 1st pair the hand forms more than half the total 

 length : the lower border of the ischium is serrated, and there is a spine -at the 

 proximal end of the merus, but the other joints are smooth : the carpus is as 

 broad as, and a little more than half the length of the palm : the hand is as long, 

 but not as broad, as the carapace : the dactylus is longer than the fixed finger, 

 but shorter than the palm; the fixed finger has a single large tooth on its 

 cutting edge. 



In the smaller of the large chelipeds of the 1st pair the merus wants the 

 proximal spine, and the wrist is about as long as the palm. 



