Podophthahnia and Entomoshyaca. 275 



ending in two filaments; external antennas always furnished 

 with a scale. Pedipalps with their last joint flattened and 

 toothed on the edge like a comb. First pair of legs shorter than 

 the foot-jaws, and having small hands ; second pair longer, their 

 wrists many-jointed, and hands smaller than those of the first 

 pair. 



I have drawn up fresh characters of this well-known genus, 

 for comparison with those hereafter to be described. 



Hippolyte producta, n. sp. PI. XIII. fig. 5, 



Forma gracilis atque attenuata. Scutum dorsale cylindricum, neque 

 gibbosum neque crassitudine abdomen excedens. Rostrum hori- 

 zontal, prselongum, acuminateque cultrellatum, squamam anten- 

 narum elongatam multo superans : dens marginis superioris unus 

 prope basin supra oculos positus ; marginis inferioris dentes qua- 

 tuor omnes ultra dentem superiorem positi. Margo scuti anterior 

 duobus aculeorum paribus munita, unura ad rostri basin (sicut 

 in varians), alteram prope basim antennarum exteriorum situm. 

 Tehon aculeorum unum par gerens. Oculi approximati sub ros- 

 tro positi, quod, quum, ut oculos desuper videamus, conamur, hos 

 celat. Long. 1 unc. 



This is by far the most slender member of the genus with 

 which I am acquainted ; every part is elongated, the body and 

 all its members. The carapace is cylindrical ; it does not pre- 

 sent the slightest gibbosity on the back, nor at all exceed iu 

 size the first segment of the abdomen ; the lateral margins are 

 bent inwards below or wrapped round the body, instead of being 

 produced downwards, as is usually the case. The rostrum is 

 remarkably long, extending beyond the apices of the narrow an- 

 tennal scales, which arc themselves much produced ; above, there 

 is a single tooth near the base and over the eyes; below, there 

 are four teeth, of which the last is the smallest, and is situated 

 close to the apex. There is a tooth on the carapace on either 

 side of the base of the rostrum, and another behind the origin 

 of the external antenna? ; the front margin of the carapace is 

 also produced into two very minute spine-like expansions im- 

 mediately below the eyes. The telson has one pair of minute 

 teeth. The eyes, which are remarkable for their small size, are 

 placed side by side, close together, and directly under the ros- 

 trum, so that, if looked at from above, they are almost entirely 

 concealed. 



From the above description it will be at once evident that, 

 with respect to the armature of the rostrum, H. producta ap- 

 proaches both H. varians (Leach) and H. viridis (Otto)*. From 



* This species is the H. Whitei and H. Mitchellii of Mr. William Thomp- 

 son (Ann. Nat. Hist. ser. 2. vol. xii. p. 110, pi. 6). Mr. Adam White, in 



18* 



