198 DR. Vr. T. CALMAN ON THE MACRUROUS [Mav. 6, 



thirds of length of carapace, hoiizontal, teeth ''~\^_^ "' , unarmed 

 above for one-fourth of its length. Antei-o- lateral spine of cara- 

 pace small, set close to front edge. Antennular peduncle a little 

 shorter than antennal scale. Distal edge of scale (Plate XIII. 

 fig. 39) not projecting so far as the external tooth. Third maxilli- 

 peds not reaching to end of second segment of antennular peduncle, 

 terminal segment a little shorter than preceding. First perjeopods 

 (Plate XIII. fig. 40) short and stout, not reaching middle of first 

 segment of antennular peduncle, breadth of carpus about two- 

 fifths of its length ; chela one and a half times as long as carpus, 

 two and a half times as long as broad, palmar poition slightly 

 shorter than fingers. Second perseopods (Plate XIII. fig. 41) not 

 reaching end of first segment of antennular peduncle, breadth of 

 carpus one-fifth of its length ; chela equal to carpus, abovit four 

 times as long as broad, palmar poi'tion little more than half of 

 length of fingers. Third perfeopods reaching well beyond, fifth 

 pair falling short of tip of thii'd maxillij:>eds. Merus of last thi'ee 

 pairs with two, sometimes thi'ee, spines on distal part of the lower 

 niai-gin, carpus with two spines side by side. Dactylus in each 

 case a little less than one-third of length of propodus, that of 

 third pair (Plate XIII. fig. 42) with five,'that of fifth (Plate XIII. 

 fig. 43) with twelve spines. Telson (Plate XIII. fig. 44) a little 

 shorter than sixth abdominal somite. Outer plate of uropods a 

 little shorter than inner. 



Total length 7 mm. Eggs "25 x '15 mm. 



Remarks. — This species resembles the preceding very closely, 

 but the distinguishing charactei's are constant in all the specimens 

 examined. 



Occurrence. — Niamkolo Harbour, 7.ix.04. " Dredged in about 

 3 fathoms, among shells." Two specimens. 



Kirando, l.xii.04. " Taken in about 8 fathoms of water, 

 among shells." Many specimens. 



Utinta, 6.xii.04. " Dredged in about 15 fathoms among shells." 

 Twelve specimens. 



Genus Caridella, gen. nov. 



Perfeopods without exopods ; carpus of first pair excavated 

 distally, that of second pair not excavated ; chelfe of both pairs 

 with a distinct palmar portion. Epipods on the first three pairs 

 of perasopods. ISTo pleurobranchia on the last thoracic somite. 



Tj^pe, C. cunnivgtoni, sjj. n. 



This new genus is intermediate to some extent between Caridiva 

 and Limnocaridina. It resembles the former in the general 

 structure of the mouth-parts, in the presence of an outer plate 

 on the first maxilla and of a minute epijiod on the first maxilliped. 

 It approaches Limnocaridinci in the reduction of the branchial 

 system and especially in the absence of the posteiior pleuro- 

 branchia, while sevei'al of the gills in the anterior part of the 

 branchial chamber are also absent or reduced to small vestiges. 



