DUBLIN NAirmAL niSTORT SOOIETT. 



119 



D1A8TTU8 Rathkii (JTr. sp.). Scohpiontra vtjxoaris (/. F. Th. MSB,) 

 Alaxtna bostrata ( Goodsir). Cuma RAinKn (Kroyer). 



Dublin : near Skerries, by the late Robert Ball, LL. D. (rtifc Thomp- 

 son's "Natural History," vol. iv., p. 392); Newcastle, Co. Down (W. 

 Thompson ) . I have not verified this last South of Ireland (J. V. Thomp- 

 son). 



" VArNTHOMPsoNiA {Spence Bate), 



* * Carapax angulos laterales ante oculos convenientes. Antenna) supc- 

 riores nulloo. Fereit segmenta quinque posteriora carapace nuda. FUo- 

 poda pare ultimo excepto, absunt. Telson perparvulum. 



" The lateral angles of the carapax meeting before the eyes ; upper 

 antennsB wanting ; five posterior segments of the pereion (thorax) not 

 covered by the carapax ; all the pleopoda, the last pair excepted, absent; 

 telson rudimentary. 



VATTNTHOMPSOirrA CRIST ATA {8p. BoU), 



ScoRPioNURA VULGARIS {J. V, Tkompson). 



a, antenna ; 3, posterior pleopod. 



" Carapacis rcgione dorsali medio cristato, denticulate. 

 ** The anterior portion of the central dorsal region of the carapace with 

 a ridge of minute teeth ; lower antenna), four joints, the last a fila- 

 mentary appendage ; posterior pleopoda, with their rami unequally two- 

 jointed, as long as the peduncle, and armed with stout spines arranged 

 chiefly along the inner margin; telson triangular, squamiierous, ciliated. 



" Length 25 inch. 



** The figure and description are firom a female carrying ova ; there 

 are several specimens in the oollectioD, two of them wi^ ova. 



** This species approximates nearer to Cuma Ei¥Hiri9%%{Krcytr) than 



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