7G6 ANTICOMA: A GENUS OF FREE-LIVING MARINE NEMATODES, 



Later, De Man found an Anticoma at Naples which he described 

 and figured under the specific name tyrrhenica, remarking that 

 the difierence between it and Eberth's 0. acuminattcs might not 

 be very important. There is reason to believe that the worai 

 which De Man had before him was in reality the same that 

 Eberth had described. Eberth's acuminates, i.e. Bastian's lioiialis 

 and 2Jelhtcicla, is one of tlie commonest species along the coast at 

 Naples. During a somewhat careful examination of thousands of 

 free-living Nematodes collected at Naples during the autumn and 

 winter of 1888-9 the writer has as yet observed but a single 

 species of Anticoma, namely, Bastian's limalis. De Man's specimen 

 measured 1-3 mm. Ariticoina limalis sometimes, but not often, 

 comes to maturity at that size. These facts, together with tlie 

 general accoixl among the figures of Eberth, Bastian, Biitschli 

 and De Man, and the latter's own remarks on tyrrhenica, lead me 

 to believe that, up to 1878, the species first discovered by Eberth 

 had been described under four different specific names, — acumi- 

 natus, limalis, pellucida and tyrrhenica, — and I suggest that 

 henceforth all these names be regarded as synonymous. The 

 species becomes then Anticoma acuminata, Eberth (Syn. A. 

 limalis. Bast., A. pellucula. Bast., A. tyrrhenica, D.M.). 



Only two other species of Anticoma have been described, 

 namely, A. Eherthi, Bast., and A. leptura, Marion. I here add to 

 the genus its fourth species under the name A. tyjjica. 



Anticoma, Bastian. 

 A genus of marine Nematodes having the average formulse 



•2 10-3 19-8 '46'^® 89-5 „ j -2 W8 20" -'M^" 90-2 „ „ tt • n 



7—3^ — ^ — 3:5 — jTgS mm. and .g— ^^ — ^ — jjTj — fg 2-6 mm. Hairs so small as 

 generally to escape notice occur on the cuticula throughout the 

 length of the worm. On the lateral lines, however, and sometimes 

 on others of the six main lines, occur, near the head, longitudinal 

 rows of closely approximated and innervated pectoral hairs, which 

 will be rarely overlooked by the careful observer. From the 

 position of these peculiar hairs the genus takes its name. Tliere 

 are ten cephalic setfe ; one dorsal, one ventral, and a pair on eacli 



