786 MK. U. C. LILLIK UN TlIK ANATOMY i^^"'^)' -"^J 



CiUiiils of ;ill till' others contaiiu'il .]/r(/<tiii/c(ij)/uiiie.<i iinrrpyica 

 M. 8ai-.s (fonncrly called X ijctiphanes norreiiica). (Jtlier species 

 of Euphausiidie may have heen present but only tiie above 

 mentioned was definitely determined. In the pharynx these 

 t'riistaceans were fmiiid practically intjict ; in the stomach they 

 were more broken up. nnd in the intestines they were reduced to 

 a thick terra-cotta colovued fluid, the red colour beini,' due to a 

 red pi_i,'ment commonly found in the Euphausiida'. 



Fatases.^On July 31st, 190i), two female B. nmscidns were 

 Idlled, one was G^i feet long and contained a fcetus 1 foot in length. 

 Tiie other was (57 feet long and contained a fietus 5.4 feet in length. 

 This tends to support the view that the species under consideration 

 and ]iossil)ly other species of JJala'uoptera have no definite 

 breeding season. 



Parasites. — The external surfaces of all the B. muscalas 

 examined were entirely free from parasites with the exception of 

 the baleen plates. Tliese were very frequently coated with the 

 adult forms and nauplius larvje of Bakenophilas unisetas Auii- 

 villius. These remarkable Copepods have been found on the 

 baleen plates of />'. horeaUs and B. sibbaldii *, but this appears to 

 be the first record of their occurrence on B. musculas. 



2. Bal,exoi>tera sibbaldii Gray (/i. latirostris Flower). 



The external characters of all the Innishkea specimens wei-e in 

 airreement with the descrii)tions of the species given by previous 

 observers. 



The inside of tlie iiiontli, tlie lialeen. bristles, palate and tongue 

 were entirely l)lack. 



The forms of i,he paddles and do)'sal fins of B. sihhaldil differ 

 from those of B. muscuhis, as is shown by the diagrams (text- 

 li<'s. 76 it 77). It would seem that the presence of a dorsal fin is 

 restricted to the fast-swimming Cetaceans. 



The contents of the alimentary canals were examined in the 

 case of some ten individuals of this s{)ecies, caught during Augu.st, 

 and found to consist exclusixel}' of Meyauycirphanes norieyica 

 in all cases. 



A young male mend)er of this species, 63 feet long, was killed 

 while following the mother and feeding ujion her milk. The 

 specimen had Crustaceans in its .stomach, showing that it did not 

 depend entirely u])on the mother for food. The young of 

 Ji. sibbaldii are said to Ve between 20 and 30 feet in length at 

 birth, so, unless the period of lactation is unusually prolonged, 

 tliis would point to a comparatively i-apid growth and develop- 

 ment in the larger Cetacea as is maintained by Mr. Haldane t. 

 If the j)eriod of lactation continued, as is generally sup}:osed, for 

 one year the animal would increase in size to the extent of over 

 30 feet in its fir.st yesir of life. 



The external surfaces of all the individuals of this sjiecies were 



• C'olli'tt, I'roc. Zool. S(.c. 1HH(!. p. 'iW. 



t HttUlaiii', Aiiimls nf Scottish X;it. lli>t. Ai.ril ISK).'.. p. CJW. 



