156 ASILUS, 



8 12. ASILUS. Spec 48. 

 tfstuans, (hornet-fly,) cinereous, having the three 



last segments of the body white. 

 tfstivus, cinereous, having three black lines on the 

 thorax ; legs dark coloured ; shanks testaceous. 

 See MS. P. 



10 1. ASTERIAS. Spec. 37. 

 aculeata, (sea-star,) rays five ; disk orbicular, 



covered with glabrous prickles. 

 aranciaca, rays somewhat depressed and prickly 



along the margin : disk broad. 

 caput medusae, (medusa's head,) five rays perpetu- 

 allv bifurcate into numerous branches. 

 See i\jS P. 



4 4. ATHERINA. Spec. 5. 



menidia, (silver-fish,) anal fin 24-rayed ; body- 

 small, pellucid, Spotted. 

 See MS. P. 



8- 5. ATTELABUS. Spec. 37. 

 pensylvanica, black ; shells reddish, with a black 

 band in the middle and at the tip. 

 See MS. P. 



B. 



14 1. BACILLARIA. Spec. 1. 



paradoxa, (straw-threads,) perpetually changing 

 its appearance, so that it might at one moment 

 be taken for a different species from that of the 

 preceding moment. 

 See MS. P. 



1 8. BALJENA. Spec. 8. 

 nysticetusj (common whale,) nostrils flexuous, on 

 the forepart of the head ; dorsal fin none. 1 Var. 



