Crustacea. 5777 



colour. The broad black band on the further segment is most dis- 

 tinctive, and very different from the black patches occasionally found 

 in a similar situation in the common shrimp. 



Sculptured Shrimp (Crangon sculplus, Bell). A single specimen 

 dredged on the scallop bank, Bray, December, 1856. 



Channel-tailed Shrimp {Crangon Allmani, mihi). Met with in some 

 abundance on scallop bank, Bray, in about 25-fathoms water. Spawns 

 in March. Ova dirty grayish colour. (For description of this new 

 species see Zool. 5759, and Nat. Hist. Rev. vol. iv. p. 80). 



Varying Sand Shrimp (Hippolyte varians, Leach). Extreme litto- 

 ral zone, in sand-pools, from April to June, abundant ; in Zostera 

 banks, Sandycove ; at Howth, rare ; Merrion Strand, washed in, very 

 rare ; also dredged in Dalkey Sound, but rare. Generally of a pink- 

 colour. Spawns April to June. Ova dark chocolate-brown. Its 

 variety of colours well deserve its specific name. The beak varies 

 considerably in form and dentition. 1 never met with a specimen, 

 however, in which the posterior superior tooth was absent. It is a 

 difficult species to keep in a vivarium. It occurs in lobster pots. 



Short-beaked Sand Shrimp [Hippolyte Cranchii, Leach). In the 

 same pools as the last, but much rarer ; also Merrion Strand, where 

 it has occurred several times. I have neither dredged it nor seen it 

 in the lobster pots. Spawns in May. Ova dark chocolate-brown : 

 its beak often quadridentate above. 



Kroyer's Sand Shrimp (Hippolyte pusiola, Kroyer). Common in 

 coralline and extreme larainarian zones ; hence frequently dredged in 

 Dalkey Sound, and on the scallop bed, Bray ; common in lobster pots ; 

 I never saw it in sand-pools. I first met with the species in 1854. 

 The spine over the orbit and the simple apex of the beak, irrespective 

 of other characters, distinguish it at once from H. Cranchii. Spawns 

 in April, May and June. Ova bright emerald-green. 



Thompson's Sand Shrimp (Hippolyte Thompsons, Bell). Extreme 

 laminarian and coralline zones, but rare. Dalkey Sound ; Bray. 



Common iEsop Prawn (Pandalus annulicornis, Leach). Rock- 

 pools, rare ; laminarian and coralline zones, not uncommon ; scallop 

 bank, in hundreds; also in the lobster and crab pots. Spawns in 

 March. Ova pale purple. Occasionally brought to market as 

 shrimps. 



Blue-banded Prawn (Palcomon Squilla, Leach). Rock-pools, ex- 

 tremely abundant. In the summer months this species is found 

 abundantly in the pools at Sandycove. Many of these pools are 

 small in size, and have little communication with the sea; perhaps 

 XV. 3 K 



