28 Mr. P. II. Gosse on new or little-known Marine Animals. 



haunches are moderately distant at their origin, springing from 

 the margin of the body, the shield being notched to give them 

 exit ; the third joint of the legs is the largest, much swollen in 

 the first pair (fig. 1) ; the fifth is also large, and the sixth (the 

 terminal one) is long, but slender, tapering abruptly from the 

 middle ; the claws (fig. 5) are simple hooks, much curved, neither 

 pectinated nor tipped with an accessory piece, but the joint 

 from which they spring is tipped with two nearly parallel styles : 

 the legs are equal in length. 



The shield of the body above is subtruncate in front, but pro- 

 jects in a small medial point (fig. 2) ; its general form is long- 

 oval, with a transverse sulcus at the origin of the second legs ; 

 this sulcus, however, does not extend across the whole breadth, 

 being met on each side by a bent longitudinal sulcus, which cuts 

 off a wing-like portion, on which is seated a large crescent- 

 shaped dark eye. Below, the body has two transverse divisions 

 (fig. 1) ; one at the origin of the first legs, another at the origin 

 of the third ; these two impart the aspect of the division into 

 head, thorax and abdomen, of a beetle : there is also a narrow 

 longitudinal portion separated on each side. 



The rostrum (fig. 3) forms a thick bulb tapering to a point, 

 from which during life I observed two apparently soft, flexible, 

 filiform, divergent organs (mandibles ?) protruded and retracted 

 (fig. 1). At a strong shoulder on each side of the rostrum, 

 about one-third from its point, is articulated a palpus of four 

 joints, of which the second is by far the largest ; the terminal 

 one is a style, slightly curved, pointed, and furnished near the 

 base with two strong bristles on the inner side, and one on the 

 outer. All the joints of the legs are armed with a few short 

 bristles. The vulva (fig. 1) occupies a large oval area at the hind 

 part of the venter, and the anus is terminal. 



This little species is not uncommon at Weymouth, among sea- 

 weeds from low-water-mark ; and I find it in my tanks, crawling 

 up the glass, always immersed ; doubtless introduced with weed- 

 covered stones. 



Sp. 2. H. ctenopus (mihi). Plate III. figs. 6-10. 



Body divided below only; claw of palpus a stout pointed 

 hook ; hind legs longest, but otherwise alike ; claws of all pecti- 

 nate ; whole surface smooth. 



Description. — Length of body to tip of rostrum ^^^nd of an 

 inch ; colour dark-red above with a white line down the centre 

 of the back ; under parts cream-white, very satiny ; legs trans- 

 parent-corneous. The shield of the upper parts (PI. III. fig. 6) 

 is entire, nearly oval, but projecting into a point over the rostrum ; 



