410 Prof. E. Forbes on some Additiom to the British Fauna. 



tex broad ; front slightly impressed : eyes of moderate size, not pro- 

 minent : ocelli disposed in a triangle on the vertex : antennae slender, 

 subclavatc, inserted near the mouth, shorter than the thorax ; first 

 joint long, slender, slighth^ curved ; second joint cyathiform ; third, 

 fourth and fifth joints equal in size ; club 2-jointed, conical, acumi- 

 nate, longer than the fifth joint : thorax elliptical : prothorax trans- 

 verse, very short : scutum of the m.esothorax broad ; sutures of the 

 j)arapsides distinct ; axills! not complete ; scutellum obconic : meta- 

 thorax transverse, very short : propodeon large, obconic, declining, 

 excavated lengthwise : podeon very short : abdomen oval, smooth, 

 depressed above, keeled beneath, much shorter and rather broader 

 than the thorax ; the disc purple ; metapodeon occupying about one- 

 third of the dorsum ; octoon and following segments to the telum 

 transverse, short, nearly equal in size : legs green, slender ; tro- 

 chanters and protibias piceous ; knees fulvous ; mesotarsi and meta- 

 tarsi yellow, their tips piceous : wings limj)id ; nervures pale yellow ; 

 humerus rather sliort ; ulna longer than the humerus ; radius very 

 short ; cubitus rather longer than the radius ; stigma very small. 

 Alten, Finmark. 



LII. — Notice of some additions to the British Fauna discovered 

 hy Robert MacAndrew, Esq.^ during the year 1844. By 

 Professor Edttard Forbes of King's College^ Loudon. 



[V/ith a Plate.] 



Among the many additions to the British Fauna laid before the 

 Natural History Sectiou of the British dissociation at York, some 

 of the most interesting were exhibited by Mr. MacAndi-ew of 

 Liverpool, who, though lie has comparatively lately joined the 

 ranks of Natural History, promises to do good service to Britisli 

 Marine Zoology. His researches have hitherto been conducted 

 chiefly on the western coasts, especially among the Hebrides, 

 where there is doubtless a fine field for discovery as yet but par- 

 tially explored. He has entrusted to me the description of the 

 following animals, which appear to be new to the natural history 

 of om- country. 



MOLLUSCA. 



1. Emaryimda crassa, Sowerby, Min. Con. t. 33. 



This is the largest European species of its gcims and the most 

 beautiful. Hitherto it has been noticed only as fossil. 



The shell is ovate, about twice as long as high ; the apex is 

 subcentral and acute ; the upper surface is sculptured by about 

 forty radiating fasciculated ribs, each composed of four or five 

 smaller ones, reticulated by close furrows of gi'owth. The notch 

 is broad and occupies about one-fourth of the fissural ridge, which 

 is arched, slightly elevated, longitudinally striated and regularly 

 and closely squamated ; the internal cavity is smooth, and presents 

 an elevated ridge with a central groove running from the sides 



