1903. ] NEW PARASITIC COPEPODS. 107 
Posterior antenne 3-jointed, rising just in front of the upper 
lip; at the distal end and anterior border of the first and second 
joints are two short sete, the third terminating in two bristles, 
the anterior being very long. 
Mouth and appendages placed rather far back; the labrum is 
triangular, projecting backwards ; labium simple, rounded. Iwas 
able to make out only 2 pairs of maxillipeds; the first very small, 
biarticulate, terminating in two short hairs: the second uncinate, 
with large globose basal joint, to which was articulated a sharp 
curved claw. 
Text-fig. 12. 
Ventriculina crosslandi 9, gen. & sp.n. A. Ventral surface, X 10. B. Dorsal 
surface. C. Ventral surface much enlarged, showing articulate appendages. 
D. Posterior antenn. 
Only three pairs of thoracie limbs present: the first rising from 
the posterior under surface of the cephalic segment, minute, 
biramose, each ramus terminating in a single bristle; second and 
third pairs uniramose, made up of two articulations, the distal 
terminating in two small bristles. 
3 not known. 
ADDENDA to Systematic Enumeration of Species of Parasitic 
‘ Copepoda found on Fish (Proc, Zool. Soc. 1899, p. 438). 
ERGASILIDA, 
1. Eucanthus marchesettii Valle, Atti Mus. Civ. Trieste, vil. 
p. 245 (1885). On Motella tricirrata. 
2. Ergasilus centrarchidarum Wright, Proc. Canad. Inst. (2) i. 
p. 243 (1883). 
3. Lrgasilus biuncinatus Gadd. Meddelanden af Societas pro 
Fauna et Flora Fennica, xxvii. pp. 181-182 (1901). On 
Gastrosteus aculeatius. 
