29 



5. a. Abdominal median spines : 1, 1, 3, 3, 3, 2, 1, 



E. spinoculatus , Bouvier. 

 b. Abdominal median spines : 1, 1, 2, 2, 2, 1, 1, 



E. hihernicus, n. sp. 



6. a. Spines on posterior part of median carapace 



carina: 2, 2, 1, 2, .. E. Faxoni, Bouvier. 



b. Spines on posterior part of median carapace 



carina : tubercle, 2. Carapace broader than 

 long, . . . . . . E. Alberti, Bouvier. 



7. a. Tip of telson bears four very long and slender 



pinnate processes, . . E, Puritanii, Lo Bianco. 



&. No such processes present, . . . . . . 8 



8. a. Basal part of telson bears two median spines, 



E. spinulosus, Faxon. 

 b. Basal part of telson bears one median spine, . . 9 



9. a. Basal joint of antennular peduncle bears one 



external spine, . . . . E. Scharffl, n. sp. 



b. Basal joint of antennular peduncle bears two 



external spines, . . . . E. Kempi, n. sp. 



Eryonicus Faxoni, Bouvier. 



PL IV, figs. 1-5. 



Eryoneicus Faxoni, Bouvier, 1905 (a). 

 Eryoneicus Faxoni, Bouvier, 1905 (5). 



This species is in many ways very similar to that described 

 by Faxon (1895) as E. coecus, Spence Bate, but it possesses 

 several characters which at once serve to distinguish it. 



It has the large and globular carapace characteristic of the 

 genus-. It is broadest in the branchial region and narrows 

 considerably anteriorly ; the posterior end is somewhat truncate 

 but has rounded angles. When seen in profile the top of the 

 carapace appears almost flat, ascending slightly from back to 

 front, till it reaches a point three-fourths of the length from the 

 hind margin, when it turns abruptly downwards, sloping very 

 steeply, almost vertically, to the rostrum. E, Faxoni belongs 

 to the division of th^ genus in which the spines on the carapace 

 are almost entirely confined to definite rows running length- 

 wise along the surface. Between these rows the carapace is 

 devoid of spines, and has merely a few setae scattered over it. 

 The rostrum is marked by a pair of small spines in the centre 

 of the frontal margin between the orbital sinuses. The internal 

 angle ot each sinus is also marked by a spine sharper but not 

 so thick as the rostral ones. The sinuses themselves are fairly 

 deep and Very broad, and do not become narrower backwards. 

 Externally each is bounded by a sharp spine, which is the most 

 anterior of a row extending along the whole lateral margin 



