﻿The Sympoda. 153 



laccus (Liljeborg), 1856. to which Sars added L. longimanus, L. 

 macriLvus, and L. villosus in 1869, the first of these having been 

 described in 1865 under Diastylis. In 1873 he described L. mancns, 

 re-described by Zimmer in 1902, and by him transferred to Diastylis 

 in 1908. L. prodmtus, Norman, dates from 1879, and has been 

 followed by L. antipus, Zimmer, L. crassicauda, Zimmer, both in 

 1907, with L. gmcilis and L. borealis, Stappers, in 1908, and here a 

 new species. Dr. Stappers suggests the possibility that his two 

 species may prove to be only the two sexes of a single species, but 

 deems it very improbable. 



Leptostylis ivalheri, Caiman, 1907, is transferred to a new genus 

 Ehleptostylis, in which the short telson is furnished with many 

 lateral spines, and in the male has a lobe uniquely produced over 

 the narrow distal portion. 



Leptostylis macruroides, n. sp. 

 Plate LYI. 



This species combines some of the characters iov which. Leptostylis 

 macrurus and L. villosus are notable. The latter is described by 

 Sars as having the lower edges of the pseudorostral lobes " through- 

 out divided into peculiar lamellar serrations." These resemble a 

 machicolabed parapet, and this curio as feature occurs in the new 

 species, which, however, is easily distinguished from L. villosus both 

 by the carapace and the uropods. On the other hand, to L. macrurus 

 of Sars it makes a near approach in these and some other respects. 

 The proportions and general appearance are certainly very similar. 

 But the carinas in L. macrurus are serrate in the ordinary way, not 

 machicolated ; the telson is " but slightly uarrowed distally," 

 instead of much narrowed ; the rami of the first pleopods are more 

 strongly developed ; and other differences combine with these to 

 separate it from the southern form. 



The dorsal line of the carapace is convex between a slightly 

 upturned pseudorostral projection and a slight upturning of the hind 

 margin. From the base of the pseudorostral projection issue two 

 long curved lateral carinas which reunite before reaching the hind 

 margin ; each of them is machicolated in the anterior half, the 

 upper one then becoming serrate, the lower one almost smooth ; the 

 eyelobe is small, seemingly eyeless ; the whole surface is pitted with 

 minute glassy circles, each with a microscopic hair, Some at least 

 of the pedigerous segments and the first two of the pleon segments 

 have long slender latero-ventral spines, of which no mention is 



