EOLIDID^!. 99 



two lateral crests, on which are the eyes; foot 

 very narrow. 



L. nigra. Fig. 130 ; mag. 



FAMILY II. EOLIDID^E. 



With gills in the form of lengthened warts 

 (papilla), arranged along the sides of the back ; 

 tentacles not retractile, without sheaths ; tongue- 

 teeth central, without laterals ; skin smooth, with- 

 out spicula; no mantle. 



Eolis (Cuv.). Tentacles four, slender, the dorsal 

 pair sometimes ringed ; gills simple, cylindrical ; 

 tongue-teeth comb-like. 



* Gills numerous, depressed, overlapping : 



E. papillosa. 

 Alderi. 

 glauca. 



** Gills clustered : 



E. coronata. Fig. 131 ; n.s. E. smaragdina. 



Drummondi. elegans. 



rufibranchialis. carnea. 



pellucida. glaucoides. 



gracilis. fineata. 



alba. Landsburgii. 

 punctata. 



*** Gills in transverse, rather distant, rows : 



E. angulata. E. picta. 



nana. tricolor, 



concinna. Farrani. 



aurantiaca. amoena. 



olivacea. pustulata. 



cingulata. Peachii. 



vittata. stipata. 



Northumbrica. inornata. 



viridis. Couchii. 



arenicola. Glottensis. 



purpurescens . amethystina. 



cserulea. exigua. 

 H 2 



