588 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.55. 



depression, funnel shaped and semilunar, the lumen of which is 

 occupied by a chitinous lamina." 



This was interpreted as a sort of sucker for prehension, but of 

 course performs no such function as that. 



In endeavoring to locate the genus Cornalia called attention to 

 the resemblance between Sphyrion and " Lophoura " in the general 

 make-up of the body, and between ^'■Lophoura'''' and Haemobaphes 

 in their mode of attachment to their host and in the body divisions. 



Genus TRYPAPHYLUM Richiardi. 



Lerneoncma, part, P. J. van Benkdek, Ann. Sci. Nat., ser. 3, vol. 16, 1851, 

 p. 125, pi. 6, figs. 11 and 12; Bull. Aci^d. Belgique, vol. 18, 185], p. 287, 

 pi. 1 ; L'Institut, vol. 19, 1851, p. 285. 



Lernconema Vogt, Recherches Coti&res, 1877, p. 69, pi. 3, fig. 11, male. 



Trypaphylum Richiaedi, Atti del Soc. Toscana, vol. 1, 1878, p. xx. 



Lernaeenicvs Bassett-Smith, Proc. Zool. Soc. London, 1899, p. 485. 



Tripaphylus Cabus, Prod. Faunae Mediterraneae, 1885, p. 372. 



Tripaphylus T. and A. Scott, British Parasitic Copepods, 1913. pp. 160 and 

 229, pi. 45, fig. 6 ; pi. 51, fig. 1 ; pi. 49, figs. 1-7. 



Generic characters of female. — Body slender and greatly elongated, 

 without segmentation. Cephalothorax rounded and provided with 

 stiff cartilaginous horns. Free thorax forming a long and slender 

 neck, filiform antieriorly, considerably widened posteriorly. Trunk 

 narrowed anteriorly to the width of the neck, widened posteriorl.y 

 and furnished with two long and slender posterior processes, which 

 r.re straight, cylindrical, and smooth like those in Paeon and Opirma. 

 Antennae and mouth parts similar to those of Lemaeenicus. 



Generic characters of male. — Cephalothorax slender, conical, with- 

 out a carapace and with no external indication of the testes. Thorax 

 indistinctly segmented anteriorly, completely fused posteriorly ; gen- 

 ital segment swollen and tipped with a pair of slender conical 

 processes; no abdomen. First antennae uniramose, indistinctly 

 jointed; second pair biramose, the exopod chelate. Mandibles with 

 strong curved teeth at the tip like those in the Lernaeopodidae. Basal 

 joints of second maxillae and maxillipeds fused, terminal joints 

 free and armed with strong chelae. 



Type of the genus. — Trypaphylum musteli, monotypic. 



{Trypaphylum, Tpuwaw, to bore and (piiXov, race or tribe.) 



Bemurks. — In 1851 P. J. van Beneden established a new species 

 which he named musteli and referred to Milne Edwards's genus 

 Lemeonema. He obtained it from the gills and pharyngeal cavity 

 of Mustelus vulgaHs on the Belgian coast. Later in the same year 

 he published a more complete account of the species. Vogt in 1877, 

 reviewing Beneden's description and figures, said that the male 

 showed that the genus belonged to the Lernaeopodidae. Bassett- 

 Smith in 1899 assigned the species to the genus Lernaeenicus without 



