CRUSTACEA MALACOSTRACA. II. 



the figures published by Sars that the only feature worth mentioning is, that the movable lobe on 

 the left mandible is very large, being a little longer and probably broader than the incisive lobe. 

 Consequently, I suppose that Sars' description and figures in all points of any importance hold good 

 for all species described in the following pages. 



The genus Typhlotanais (females and immature males) may be characterized by the following 

 diagnosis. Eyes wanting. Antennulae three-jointed; first joint at least as long as and generally longer 

 than the two other joints combined, second joint proportionately short. Antennae with fourth and 

 fifth joints completely fused, without any suture between them. Mandibles well developed with their 

 molar process cylindrical or even a little thicker at the obliquely cut, dentate end. Chelae slender, at 

 least two and a half times as long as broad. Second pair of legs differ conspicuously from third or 

 fourth pair by having seventh joint with claw considerably longer. Pleopods well developed in the 

 female. Uropods with the rami slender, two-jointed or one-jointed. Incubatory pouch consists of four 

 pairs of lamellae. -- (Adult males of all species unknown excepting of T. finmarchicus G. O. S., which 

 has been described by Sars). 



21. Typhlotanais irregularis n. sp. 

 (PI. Ill, figs. 5a- 5 e.) 



Female. Body moderately robust, somewhat more than five times as long as broad. -- Cara- 

 pace somewhat or considerably shorter than the two next 'segments combined, a little longer than 

 broad, with the lateral margins somewhat convex, the front margin two-thirds as long as the posterior 

 and the median process moderately long, acute. 



Antennulae (figs. 5 a and 5b) considerably shorter than the carapace, rather stout. First joint 

 considerably longer than the two other joints combined, not fully two and a half times as long as 

 deep and tapering considerably and gradually from a little from the base to the end; second joint 

 scarcely as deep as long and about half as long as the third; the longest terminal seta scarcely as 

 long as third and second joints combined. Antennae moderately robust; third joint not thickened; 

 fourth considerably less than twice as long as the penultimate joint; terminal setae scarcely as long 

 as those of the antennulse. 



Chelipeds (fig. 5b) moderately strong. Basal joint with the proximal protuberance somewhat 

 short; the distance between its posterior end and the front lower angle of second thoracic segment 

 about as long as the basal joint. Carpus distinctly longer than the basal joint and almost twice as 

 long as deep. Chela (fig. 5c) distinctly longer than the carpus, about three times as long as broad; 

 movable finger somewhat longer than the front margin of the hand; both fingers very acute; fixed 

 finger near the base considerably broader than the movable and with an acute tooth somewhat from 

 the end of the incisive margin. 



Thoracic segments (fig. 5a) peculiarly shaped, decreasing in breadth from second to seventh, 

 the latter being only slightly more than half as broad as the second; furthermore the segments in- 

 crease a little in length from the second to the fourth and then decrease to the seventh. Second seg- 

 ment decreases very conspicuously in breadth from the antero-lateral, protruding angles to the pos- 



