Mr. C. Spence Bate on Crustacea. 119 



with the description of Crangon horeas that it is difficult to 

 believe that they are not depauperized specimens of that large 

 arctic species. 



Several specimens of Alpheus ruber have been taken on 

 shelly ground off the Dudman, — and from the same locality 

 two other specimens of ^. Edwardsiij which I believe is the 

 first time that this latter species has been recorded as British. 

 I had them alive for several days. Their colour is a bril- 

 liant red crimson, A. ruber being rather paler and more banded 

 than A. Edwardsii, One peculiar and interesting feature in 

 the structure of this animal is the alteration of the character of 

 that portion of the carapace that covers and protects the organs 

 of vision (not so much from the anterior development of the 

 carapace as from the eyes having receded beneath it), which, 

 while it offers protection to the organs of vision, yet has be- 

 come so transparent that it is only by close and careful exami- 

 nation that, in the living state, the relation of the two parts to 

 each other can be distinguished. 



The next genus to which we have to allude is one that we 

 believe must be described as new to our fauna. It was first 

 described by Costa from a Mediterranean species {Typton 

 spongicola)^ as far back as 1844, in the ' Annali dell' Accad. 

 degli Aspir. Nat. di Nap.' ii., also by Grube (Ein Ausflug 

 nach Triest und Quarnero, pp. 65 & 125), and again by Hel- 

 ler under the name of Pontonella (Yerhandlungen des zool.- 

 bot. Vereins in Wien, p. 627, Tafel ix. f. 1-15), as well as in 

 his ^ Crustaceen des siidlichen Europa,' p. pi. f. . Be- 

 lieving it to be distinct, I have given it the name of Typton 

 spongiosus^ of which the following is a short description : — » 



Gen. char. — Carapace short and deep, covering the entire 

 pereion. Pleon twice as long as the carapace, with the lateral 

 walls deep. Eyes prominent, not concealed under the cara- 

 pace ; superior antennae having a secondary branch. First pair 

 of pereiopoda equal, slender, long, and chelate ; second pair 

 large, in general the right much larger than the left. 



Spec. char. — Carapace having a short simple rostrum. Eye 

 longer than the rostrum. Anterior antenna with the secondary 

 appendage longer than the primary ; posterior antennse having 

 the squamiform plate of the third joint small, pointed, and not 

 ciliated. Second pair of pereiopoda having the propodos as 

 as long and nearly as broad as the carapace. Dactylos of the 

 right hand with the cutting margin convex and simple, of the 

 left hand less convex and cuneated. Posterior pair of pleo- 

 poda with the posterior external angle of the outer ramus 

 dentated, the inner tooth being the longest ; telson armed with 



