156 Mr. P. H. Gosse on neiv or little-known Marine Animals. 



Another had the buff of the upper parts so mingled with 

 rufous, purple and dai'k brown, as to give a warm bay tint to 

 the whole, with azure spots scattered, and a broad band of deep 

 bistre brown across the hind part of the thorax. 



Another is about equally clouded and banded with black and 

 rose-crimson ; exceedingly rich and beautiful. 



The projection of the wrist of the anterior foot on each side, 

 like an angular elbow, gives a peculiar aspect to this little 

 shrimp. 



Crang ones vulgaris, trispinosus, sculptus, fasciatus, and spinosus 

 occur in this bay with a comparative frequency indicated by the 

 order in which I have placed their respective names. 



Fam. Mysid^. 

 Mysis productus (mihi). The Long Opossum Shrimp. 



Form elongate, slender. Rostrum lanceolate, nearly twice as 

 long as the eyes. Peduncle of internal antenna elongate, 

 curving outward ; second and third joints together as long as 

 the first. Scale of external antenna about half as long as the 

 carapace, strongly toothed. 



The general form is much longer and more slender than that 

 of M. chamceleon. The rostrum is hyaline, broadly lanceolate, 

 acute, and nearly twice as long as the eyes. All the joints of the 

 peduncle of the internal antenna are lengthened ; the second and 

 third united are equal to the first, and together reach about to 

 the tip of the antennal scale. This latter is lengthened; nearly 

 parallel-sided, with the tip abruptly angular ; a strong tooth pro- 

 jects from the outer angle, from whence long cilia extend round 

 the tip along the inner edge. PI. VI. fig. 5 a. 



The middle plate of the tail (fig. 5 h) is lanceolate, with the apex 

 entire, obtuse; the base constricted; the margin fringed with 

 small spines. The inner lateral plate tapers to a point, with a 

 terminal spine. The outer plate is by much the longest, it is 

 emarginate on the outside near the tip ; the inner edge is deeply 

 ciliated, the fringe extending round the tip to the emargination ; 

 there a rather long spine occurs, followed by a series of minute 

 spines to the base. 



The colour of the only specimen found was pale umber-brown, 

 becoming redder towards the tail. The outer tail-plate was 

 hyaline, with a large stellate spot of red on its basal half. Eyes 

 black. It was taken in Weymouth Bay in July, together with 

 several of M. chamceleon. 



The species appears to combine some of the characters of 

 M. Griffithsia and M. vulgaris, but to be sufficiently distinct 

 from either. 



