Crustacea. 5759 



exceeds the weight of the specimen of U. pictorum from Fleckney hy half a drachm, 

 and falls short of the weight of the Fleckney U. tumidus by twelve and a half 

 drachms ! Although those measured are the largest I have as yet found, all the spe- 

 cimens of Unio tumidus and U. pictorum from this neighbourhood are of extraordi- 

 nary size, and none of my correspondents have ever seen any that can be compared 

 with them. 



4 1 #* n'i t 



a °* Sd ** "8 SP 



H ffl g g > 



Inches. Inches. Inches. Inches. Oz. Dr. 



1. Unio tumidus, Fleckney .. 4 T 3 5 21 9| 6 3 2 



2. „ „ Wistow A\ 2 9i 5§ 2 10 



3. „ „ Surrey Docks ... 2f a I| 6§ 4 T ^ 10 



4. „ „ New River 2 T 9 g 1§ 6§ 3$ ll£ 



5. „ „ Oxford ..., 2i H 5 T ' 3| 6 



6. Unio pictorum, Wistow 4f a 2£ 10$ 5§ 2 6 



7. „ „ Fleckney 4| 1» 9, 9 5£ 2 7 



8- „ „ 3« H 8i 4/ 13 



9. „ „ var. rostrata 3| If 6| 3-ft 5 



— Alfred Merle Norman; Kib worth, August 12, 1857. 



Description of a Galathea new to Science. — In December, 1856, at Bray, in the 

 same boats where the channel-tailed shrimp (C. Allmani) first occurred to me, I 

 met with several specimens of a small Galathea which I was at the time unable to 

 identify with certainty, further than establishing its distinctness from both G. squa- 

 mifera and G. strigosa. I was unable to procure a typical specimen of G. nexa; and 

 the description in Bell's ' British Crustacea' did not afford sufficient details to enable 

 me to pronounce a positive opinion as to the specific value of the characters exhibited by 

 my specimens. Unwilling to suppose it a new species, I marked it provisionally as a 

 variety of G. nexa, and as such exhibited and described it briefly at the Dublin Na- 

 tural History Society, at a meeting held on the 13th of March, and more particularly 

 at a meeting of the same Society held on the 17th of April. Last July, through the 

 kindness of Mr. Adam White, of the British Museum, I had an opportunity of com- 

 paring it carefully with the authenticated suite of specimens of G. nexa in that col- 

 lection, and found it specifically distinct from them, and also from what I think must 

 be considered another nondescript species obtained by the Rev. A. M. Norman at 

 Falmouth. The following is a description of the new species. 



Galathea Andrewsii, Kinahan. 



Rostrum short. Armed on each side with from four to five flattened teeth, each 

 tooth channelled in the middle, the hindermost pair situated on the orbit. Anterior 

 pair of legs narrowed, elongate, covered with a few tubercles, these generally termi- 

 nating in spines, a few squamulose. Tubercles arranged in somewhat parallel longi- 

 tudinal lines. Hands slender, narrow, elongated ; fingers very slender, nearly parallel, 



