38 EEV. T. E. E. STEBBING AND ME. D. EOBEETSON ON 



Second perceopods closely resembling the first. 



Third peraojwds. Side-plates with the front lobe nearly as deep as the preceding 

 pair, the hinder lobe much shallower. Branchial vesicles small. The first joint some- 

 what broadly pear-shaped, almost entirely unarmed ; the third joint longer than the 

 fourth, shorter than the fifth, the two latter having straight parallel margins, with 

 rather long spines at the hinder apex ; the finger curved, not half the length of the 

 fifth joint. 



Fourth 2>erceo2)ods. Side-plates small, bilobed. The first joint a little longer but 

 narrower than in the preceding pair ; the rest of the limb similar to the preceding pair, 

 but with the joints longer and more strongly armed. 



Fifth perceopods similar to the preceding pair, but on a larger scale, and the first joint 

 fringed with spinules on both margins. 



Pleopods. The two coupling-spines short and small, each with two pairs of reverted 

 teeth ; cleft spines two in number, joints of the rami about seven. 



Uropods. Peduncles of the first pair rather longer than the inner ramus, carrying 

 spines of various sizes at three or four points of the upper margin and a long one at 

 the apex of the lower ; each ramus has spines at two points of the upper margin and a 

 large group at the rather blunt apex ; the outer ramus is a good deal shorter than the 

 inner ; the peduncles of the second pair have a length intermediate between the lengths 

 of the two rami, which resemble tliose of the first pair, but are a little smaller ; the 

 peduncles of the third pair are nearly as long as those of the second, longer and much 

 stouter than the rami, which are equal, slender, acute, with spines at two points of the 

 upper margin. 



Telson. The breadth at the base equal to the length, the apical margin slightly 

 concave, equal to more than half the greatest breadth of the telson ; on either side a 

 couple of spinules are planted on a raised ridge that runs obliquely incurved from each 

 corner of the apical margin. 



Length scarcely a sixth of an inch. 



Locality. Cumbrae, in the Clyde. A single specimen. 



Hemarks. The specific name has been chosen because of the likeness presented by the 

 second gnathopods to those of Montagu's species, Melita palmata. The secondary 

 flagellum of the upper antennae is a little less rudimentary than in most species of 

 Podoceropsis. 



4. PODOCERUS CUMBKEA'SIS, n. sp. (Plate VI. B.) 



Rostrum small and blunt, lateral lobes of the head produced into a blunt point just 

 in front of the eye. Hinder angle of the third pleon-segment bluntly produced. 



Eyes round, composed of fifty or sixty ocelli. 



Upper antennoe. The first joint rather longer than broad, the lower margin carrying 

 spinules at three points; second joint considerably longer than the first, with slender 



