High and low Dimorphism. 337 



Fem al e. Length 3 mm. Eesembles iu ali particulars E. ano- 

 maìus but is far more strongly built and the 1^ antennae are even 

 more swollen. 



This speeies is separateci from H. anomahis because it never 

 occurs raixed up with it aud iuhabits a totally different station, 

 yiz. the deeper water aud miiddy material of Posillipo and Mer- 

 gellina. Otherwise I should cali it a "high" variety of H. anomalus. 



I now append a list of the speeies of Tanaidae found by me in 

 the bay. 



Tanais vittatus rf and Q rare. Ali stations. 



T. Caiolinìi (f and C rare. Ali stations. 



Paratanais Batei ^ and C . 2-3 meters in Ämphioxus sand. 



Tanaopsis laticaudata rf and C . Deep muddy material, Mer- 



gellina. 

 Leptognathia hrerimana (j^ and C . Same material as above. 

 Pscudofanais mediterraneiis. Only Q. Same material. 

 Leptocheìia Corsica. Only Q . Coralline algae on Posillipo shore. 

 L. dubia rf and Q. Yery abundant in coralline algae at Santa 



Lucia. 

 L. ììiercautilis q" and C. In Bugida purpiirotincta at Porto 



militare and mercantile. 

 L. mergeUinae r^ and Q. At Mergellina, deepish water. 

 Heftrofanais anomalus (j^ and Q. With L. dubia. 

 E. magnus rj^ and Q. Mergellina ani Posillipo. 



