42 



CRUSTACEA MALACOSTRACA. II. 



but according to Sars' figures and my examination of some of his co-types it differs in some parti- 

 culars. In T. microcheles the chelipeds have the basal joint about three-fourths as long as the carpus, 

 thus considerably longer than in T. gracilipes, and their carpus is deeper, scarcely two and a half 

 times as long as deep; furthermore the thoracic legs are on the whole a little more robust than in 

 T. gracilipes. In a specimen of T. microcheles with the ventral side of the anterior thoracic segments 

 flat and without marsupium no ventral process on second segment is found, but in three other spe- 

 cimens presented by Sars the ventral surface of the anterior segments is convex, the second segment 

 has a very large, long and broad, oblique-triangular, acute ventral process directed forwards and down- 

 wards, and each of the four following segments has a somewhat smaller but yet far from small, acute, 

 somewhat curved ventral process. 



Occurrence. The single specimen was taken by the "Ingolf". 



South of Iceland: 81.54: L,at. 63 08' N., Long. 15 40' W., 691 fm., temp. 3.9; i spec. 



25. Typhlotanais mucronatus n. sp. 

 (PI. IV, figs. 3a- 3 h.) 



Female (without marsupium). Body slender, about six and a half times as long as broad. 

 Carapace (fig. 3b) somewhat small, slightly broader than long, a little longer or somewhat shorter 

 than second segment plus half of the third; the lateral margins are somewhat convex, the anterior 

 margin is even a little more than two-thirds as long as the breadth of the carapace and the frontal 

 process very broad, proportionately rather low and broadly rounded. 



Antennulse (figs. 3 b and 3c) extremely long and slender, a little longer than carapace and se- 

 cond thoracic segment combined. First joint a little longer than the two other joints together, very 

 slender excepting its proximal fourth, which is considerably thickened below and its depth is here 

 about one-fifth of the length of the joint; seen from above (fig. 3b) the joint is rather broad at the 

 base, tapers considerably to beyond the middle, where it is abruptly narrowed a little and its distal part is 

 subcylindrical. Second joint is thin, almost three times as long as deep; third joint very thin, more 

 than twice as long as the second, with the longest terminal setse extremely long, longer than the two 

 distal joints and half of the proximal joint combined. Antennae slender but somewhat short as 

 compared with the antennulse (fig. 3c); third joint feebly thickened; fourth joint about twice as long 

 as the penultimate; terminal setae long, yet conspicuously less than half as long as those of the 

 antennulse. 



Chelipeds slender (fig. 3c). Posterior process on the basal joint moderately short; the distance 

 between its hind margin and the front lower end of second thoracic segment about half as long as 

 the basal joint. Carpus considerably longer than the basal joint, almost three times as long as deep. 

 Chela (fig. 3d) slightly longer than the carpus, almost four times as long as broad; movable finger 

 nearly half as long again as the front margin of the hand; fixed finger much broader than the 

 movable with a few low, obtuse teeth towards the end of the incisive margin. 



Thoracic segments somewhat reminding of those of 7] irregularis, increasing in length and 

 decreasing in breadth from second to fifth, decreasing in length and increasing in breadth from fifth 



