ON HEBRIDEAN CRUSTACEA, ECHTNODERMATA, POLYZOA, ETC. 203 



one-jointerl, outer terminated in a flattened spine. Telson divided almost to 

 the base, but the two portions] are in contact A\^th each other to the apex, 

 margins smooth. Fourth abdominal segment has a deep sinus on the anterior 

 portion of the dorsal margin, and behind this a large hump-like elevation. 

 Animal pure white. Dredged parasitic on Echinus escuhntus, L., in Sleat 

 Sound. 



Microprotopus, Norman, nov. gen, 



Antennae with secondary appendage. First gnathopods subchelate. Second 

 gnathopods larger than fu'st, subchelate, greatly developed in (^ , much smaller 

 in $ . Uropods terminating in simple spines, those of last pair with a single 

 ramus. Telson tubular. 



Microprotopus maculatus, lforman,n. sp. 



Mcde. — Eye small, round, crimson, situated on a lobe between the bases of 

 the two pairs of antennae. Antennte subequal, superior having peduncle 

 reaching a little beyond the peniUtimate joint of the peduncle of the in- 

 ferior antennte ; basal joint stouter than, but equal in length to, the second; 

 third joint shorter and more slender than the preceding ; appendage minute, 

 two-jointed, not so long as first joint of filament, which consists of nine or 

 ten articulations, and is of about equal length with the peduncle. Inferior 

 antennae stronger than the superior, and, as well as the superior, furnished 

 with scattered hairs, but no spines. Mandible with a three-jointed palp. 

 First gnathopods having the hand of equal length to the wrist, but broader, 

 "widening from the base to the extremity, palm oblique, concave ; nail well 

 developed, simple, extending rather beyond the palm. Second gnathopods 

 having the wrist very short, hand greatly developed, as long as, or even longer 

 than the whole of the rest of the leg, oblong, jjalm whole length of hand, 

 slightly concave, with a tooth-like process (wanting in the young) at the 

 base, and two large teeth on the distal third ; finger large, strong, curved, 

 fully as long as the hand; the inner margin under a high power of the 

 microscope is seen to be finely crenated, or, rather, rasped like a file. Uropods 

 furnished with a few simple spines ; the penultimate pair extending beyond 

 the last, Avhich have only one branch ; this branch is rather longer than 

 the peduncle, and is furnished with two or three spines on the inner margin, 

 and terminates in two spines and a cUium. Telson tubular ; apex truncate, 

 slightly emarginate, and having one or two hairs at the angles. 



In the female the first gnathopods are of nearly the same form as those of 

 the male, but the hand is rather narrower : the second gnathopods are wholly 

 different; the wrist and two preceding joints are verj' short, the former, 

 however, is the more developed, and assumes a caliculate form at its termina- 

 tion from its having a projecting seta-tipped lobe both in front and behind ; 

 hand subquadrate, narrower than the wrist, with a row of long scattered 

 setse down the centre ; palm sHghtly obhque, concave, with a few fine frin- 

 ging setae, and a single spine at the angle ; nail as long as the palm, strong. 

 Colour yellowish, more or less covered with umber -broAvn spots ; these spots 

 are seen under the microscope to be dendritic ; they often form bauds across 

 the segments, or at times so coalesce as to make the whole animal appear of 

 a brown coloiu-. Length two lines, Foimd at Tobermory in Midi, among 

 Laminariae. • 



Class POLTZOA. 



Sarupocellaria inermis, Norman, n. sj). 

 Cells regularly ovate, wholly unspined, and not furnished with any oper- 

 culum or suboral avicularia ; mandible of lateral avicidaria very short and 



