110 BRITISH PARASITIC COPEPODA. 



Anthosoma crassum has apparently a wide distribution in 

 both the north and south hemispheres. Mr. G. M. Thomson 

 of New Zealand, after describing the species, states that 

 "numerous specimens were taken from the upper jaw of a 

 porbeagle shark, Lamna cornubica (Otago Museum). Also a 

 number from the same kind of shark taken at Napier by A. 

 Hamilton " ; and he adds that " according to Gould this 

 species has been taken on the mackerel-shark, Lamna punc- 

 tata, on the coast of Massachusetts, U.S. A."* 



Genus 21. LERNANTHROPUS Blainville, 1823. 



Body broadly ovate, depressed. Cephalon oblong 

 or pyriform, with the sides incurved. Neck distinct ; 

 the posterior part in the female covered by a lauge 

 dorsal shield sometimes divided into two portions by 

 a transverse constriction, and prolonged backwards so 

 as to conceal more or less completely both the genital 

 segment and the abdomen ; in the male the dorsal 

 shield not being so large as to conceal the abdomen. 



Antennules slender, composed of five or more 

 usually seven articulations, and sometimes furnished 

 with supplementary appendages. Antennae robust 

 "and armed with strong terminal hooks. Other mouth- 

 organs somewhat similar to those of the Caligidse. 

 Thoracic legs biramose ; the first and second pairs 

 very small and rudimentary; the third and fourth 

 tolerably large ; rarni lamelliform, those of the last 

 pair usually, and sometimes those also of the others, 

 forming elongated appendages with their distal ends 

 more or less attenuated. 



Lernanthropus krbyeri P. J. van Beneden. 

 (Plate XXIX, figs. 2-5; Plate XXX, figs. 9-17.) 



1851. Lernanthropus kroyeri P. J. van Ben. (11) p. 102, pi. iii, figs. 7-9. 

 1858. Lernanthropus kroyeri Clans. (30) p. 18, pi. ii, figs. 15-19. 

 1864. Lernanthropus kroyeri Nordmann. (90) p. 508, pi. vii, figs. 5-8. 

 1879. Lernanthropus kroyeri Heider. (56) vol. ii, p. 90, pi. v, figs. 

 72-73. 



1896. Lernanthropus kroyeri Bassett-Smitb. (7) p. 159. 

 1904. Lernanthropus kroyeri A. Scott. (109) p. 43. 



* 'Trans. N. Z. Institute,' vol xxii (1889), p. 366. 



