65 



each lateral margin has 4 spines gradually increasing in length backwards, but the last lateral 

 spine is not half as long as one of the terminal spines. 



Length of the specimen, a female without marsupium, 7.2 mm. 



Dactylamblyops Holt & Tatt. 



This genus has been established in 1906 in a preliminary paper on an antarctic species. 

 In- the main paper on the Schizopoda from the "National Antarctic Expedition", 1908, Tattersall 

 described and figured the typical form and enumerated three other species, one of which is arctic, 

 while the others are from the west coast of Ireland. The new species from the "Siboga" agrees 

 on the whole moderately well with the diagnosis of the genus, excepting that the process at 

 the eyes has only its end free and that the gnathopods are considerably longer and more slender 

 than in D. Hodgsoni Holt & Tatt. and not much shorter than the first pair of thoracic legs. 



37. Dactylamblyops fervida n. sp. PI. X, figs. 2a — 2/2. 



Stat. 141. August 5. Lat. i°o'.4S., long. I27°25'.3E. 1950 m. Hensen vertical net, from 

 1500 m. depth to surface, i specimen, a-female with the marsupium half developed. 



Description. — Somewhat slender. The frontal plate (fig. 2a') is very broad at the 

 base, triangular, about twice as broad as long, with the apex narrowly rounded. Eyes somewhat 

 small, pale golden brownish: distal joint of the eye-stalks considerably broader than long, with 

 the process at the inner side of the cornea small, having only its terminal surface free. The 

 antennal squama (fig. 2d) is broad and somewhat short, not reaching the end of the antennular 

 stalk, not fully two and a half times as long as broad, with the outer margin slightly, the 

 inner conspicuously, convex, the marginal denticle not spiniform but shaped as a broad and 

 moderately short triangle; the terminal lobe overreaches the marginal denticle and is nearly 

 twice as broad as long. 



Uropoda long and slender (fig. 2^); exopod almost twice as long as the telson, between 

 ten and eleven times as long as broad, considerably longer than the endopod. Telson (figs. 2g 

 and 2 Ii) shaped almost as in D. Hodgsotti, very oblong-triangular with the end narrowly rounded, 

 scarcely twice as long as broad; the lateral margins very feebly concave a little beyond the 

 middle and armed at each side along a little more than the distal half with 19 strong spines, 

 while the end bears 2 very strong and closely set spines somewhat longer than the others ; 

 terminal setae wanting. 



Length of the female with the marsupium half developed 8.5 mm. 



Remarks. — The figures (figs. 26 — 2/) of the left mandible and its distal part, of 

 the left maxilliped, the left gnathopod and the major distal part of the endopod of first left 

 thoracic leg may convey a sufficient idea of the shape of these appendages. 



Euchaetomera G. O. Sars. 



In the "Challenger" Report Sars has given a description of this genus. In 1905 Holt 

 & Tattersall correctly stated that it is very closely allied to Erythrops G. O. Sars and pointed 



SIIiOGA-EXPEDITIE XXXVII. Q 



