SOME PARASITIC COPEPODA. 49 



ram. 



Length of female measured in the position as figured (fig. 9) 5 



Width of genital segment L8 



Length of male O'O 



Habitat. A single specimen of a female with a male attached was found on the gills 

 of Baia radlata. 



This Chondracanthus seems to be somewhat like Olsson's * Chondracanthus annulatus, 

 and at first sight, in spite of the great differences in size (5 mm. Ch. injlatus, 10-12 mm. 

 Ch. annulatus), I thought it might be a young female of Olsson's species. There are, 

 however, two important points of difference. Olsson says both the first and second pair 

 of antennae are very minute, and he mentions and figures short posterior processes, 

 which, however, he describes as shorter than the tail (abdomen). In the specimen from 

 the Starry Ray {Baia radiata) the first antennae are not developed, but the second 

 antennae are very large and strong, and there are no posterior processes. The male of 

 Ch. annulatus (length l - 4< mm.), as far as can be made out from Olsson's description, 

 would seem to be very similar except in size to the male described above. Although it 

 is very unsatisfactory to establish a new species from a single specimen, it seems in this 

 case necessary to do so. The complete absence of posterior processes is remarkable, 

 these structures being usually developed in species of Chondracanthus. Chondracanthus 

 brevicollis, Kllr., described and figured by Kroyer f , is the only species of this genus 

 known to me which is without posterior processes, and indeed it seems somewhat doubtful 

 if it should be placed in this genus at all. Kroyer himself remarks that this form seems 

 somewhat aberrant, owing to the peculiar structure of the first thoracic limbs and the 

 abdominal appendages (the caudal furca is well developed in Ch. brevicollis). The host 

 of this species is not given ; locality Moluccas, East Indies. 



Family Lern^eopodid-E. 

 Genus Lern;eopoda, Kroyer (1837). 



Lern^opoda cluthce, T. Scott. (PI. 10. figs. 21-27.) 

 1900. Lemaopoda cluthce, T. Scott, 18th Ann. Rep. Fish. Board Seotl. iii. p. 173, pi. 8. figs. 27-37. 



Lemceopoda cluthce has been described and figured by T. Scott, but the following 

 notes and a few more figures may be useful. This species seems to be very closely allied 

 to Lemaopoda longimana, Olsson \, a species which the Swedish naturalist found in 

 very large numbers (he mentions having more than 300 examples, and says he had 

 seen ten times as many) on the gills of Haia fullonica, and at times very frequently on 

 Baia batis, also from the Skager Rack. T. Scott's specimens of L. cluthce were also 

 taken from the gills of Baia fullonica, Firth of Clyde ; but although closely allied it 

 would seem that these two species are distinct. Olsson's specimens of L. longimana 



* " Prodromus fauna? Copepodorum parasitantium Scandinavia?," Acta Universitatis Lundensis, 1868 ; Lunds 

 Univer. Arsskrift, iii. p. 30, pi. 2. figs. 13-15. 

 + 1863. " Bidrag til Kunds. om Snyltekrebsene," Naturh. Tidsskr. (3) ii. p. 320, pi. 13. tigs. 3 a-d. 

 t Op. at. p. 38, pi. 2. figa. 18-22. 



