2-46 Holt & Beaumont — Surveij of Fishing -grounds, W. Coast of Ireland, 1890—91. 



73, 76, pis. xxxi.— xxxiii.). In so far as the pleopods are concerned M. longicornis 

 might be included in the genus Neomysis, from which, however, it is dis- 

 tinguished by other characters. 



Dasymysis longicornis (M.-Edw.), 



3Igsis longieorni's, Milne-Edwards, loc. cit. 

 ? 3Igsis longicornis, Heller, " Crust, pod. Siidl. Europ.," 1863, p. 302. 

 3I//sis longicornis, Gr. 0. Sars, loc. cit. 

 AcantJiomgsis platydens, Czerniavsky, loc. cit. 



Acanthomysis longicornis, Czerniavsky, op. cit., "Ease. III.," p. 75. 

 Acanthomijsis spinosissima, Czerniavsky, op. cit., " Fasc. I.," p. 135, pis. xxxi., 

 xxxii. 



Form narrow and slender, abdomen nearly straiglit. Skin hispid in all parts. 

 Rostrum obtusely angular. Eyes large, pyriform, widely separate, extending well 

 beyond the lateral margin of carapace. Peduncle of antcnnule rather elongate, 

 the second joint dorsally produced into a forwardly-directed process; the last 

 joint rather tumid and nearly equal in length to the first. Antennal scale 

 but slightly extending beyond peduncle of antennule, narrowly lanceolate in 

 form, its extremity divided from the rest by an oblique suture. Tarsus about 

 three-articulate, the proximal articulation the longer, nail slender but distinct. 

 Tebon elongate, entire ; widely dilate at the base, thence suddenly constricted ; 

 the posterior part narrowly linguiform, and densely armed at the margin 

 with numerous, unequal, lanceolate, straight or slightly curved spines, their 

 extremities with a distinct axial marking, f Inner uropod hardly longer than 

 telson, narrowly lancolate, base swollen ; otocyst oval, large ; inner margin 

 in region of otoc3^st beset with a row of spines of gradually increasing size. 

 Outer uropod one-fourth longer than inner, very narrow, with a slight outward 

 curve, apex obliquely truncate. Male, with the Jpurth pleopod not reaching the 

 posterior extremity of the sixth segment. Length of female scarcely 9 mm. 

 Pigment blackish-brown, not abundant. 



Survey. — Station 118, Ballinskelligs Bay, 32 to 28 fathoms, soft mud. 21st 

 August, 1890. 



Previous Irish Record. — None. 



f The external ctitinous sheath of the spine is suddenly thickened toTvards the distal end, the lumen 

 being thus reduced in such a way as to present the appearance of an axial line. This character (also 

 present in L. apiops (?) ) appears to have suggested to Mr. Walker that the extremity of the spine is 

 trigonal. 



