CRUSTACEA MALACOSTRACA. II. 91 



Subadult Male. The antennulse (fig. 7 i) much thicker than in the female, nearly as long 

 as the carapace; first joint twice as long as deep; fourth joint conspicuously longer than in the 

 female and distinctly longer than second. Pleopods long, about as long as the last segment (fig. 7 k) 

 and especially the exopod is long in proportion to the peduncle, but the terminal setae are only about 

 half as long as the exopod. — Length 1.5 — 1.7 mm . 



Remarks. L.ventralis is somewhat allied to L.manca and L. subaqualis but easily separated 

 by the shape of the thoracic segments, by the uropods and by the ventral process on second thoracic 

 segment. 



The mandibles of L. centralis (fig. 7 c) differ materially in the shape of the molar processes 

 from those in the species figured by Sars. The molar process of left mandible (I) is subcylindrical, 

 its end cut off obliquely and furnished with about six triangular, obtuse teeth along the major part 

 of the terminal margin and some four slender teeth at the posterior part of that margin; the molar 

 process of the right mandible has in the main the same shape, but its oblique end has few and feeble 

 teeth and besides a single spine. 



Occurrence. It has been taken by the "Ingolf" at four stations. 



South of the Davis Strait: St. 38: Lat. 59°i2' N., Long. 5i°05'W., 18701m., temp. 1.3 ; 1 spec. 



South of Iceland: St. 64: Lat. 62°o6' N., Long. i9°oo'W., 1041 fm., temp. 3.1 ; 1 spec. 



East of Iceland: St. 101 : Lat. 66° 23' N., Long. i2°05'W., 537 fm., temp.-f- 0.7 ; 1 spec. 



Jan Mayen: St. 115: Lat. 70°5o' N., Long. 8°29'W., 86 fm., temp.0.1 ; 22 spec. 



This occurrence is somewhat astonishing. It is seen that the depths of the four stations vary 

 from 86 to 1870 fathoms, the temperatures of the bottom from 3.1 to -f- 0.7 . In vain I have attempted 

 to find any valuable difference between the specimens from these stations. In the specimen from 

 Stat. 38 (1870 fm.) the sixth joint of second and third pairs of legs is a little shorter as compared with 

 fifth joint, the spines on fourth to sixth joint are longer and the uropods slightly longer than in the 

 specimens from Stat. 115, but these differences seem to me to be insufficient as specific characters. 



58. Leptognathia acanthifera u. sp. 

 (PI. IX, figs. 2a— d). 



Female (without marsupium). Somewhat slender (fig. 2a) a little less than seven times as 

 long as broad, but decreasing considerably in breadth from second thoracic segment to the end of 

 abdomen. — Carapace almost as long as the two following segments combined, anteriorly a little 

 more than half as broad as behind the middle and with the posterior two-thirds of the lateral margins 

 rather convex. 



Antennulse (fig. 2 b) somewhat short, considerably or much shorter than the carapace, somewhat 

 robust. First joint almost as long as the three other joints combined, nearly half as deep as long; 

 second joint scarcely half as long as the first, not much produced above; third joint distinctly longer 

 than deep, with the upper margin a little more than half as long as that of second joint; fourth joint 

 somewhat shorter than the second and somewhat shorter than its terminal setse. — Antennae without 

 any vestige of an articulation between fourth and fifth joint. 



