CHAETOGNATHA COLLECTED BY STEAMER ALBATROSS. 269 



5. Lateral fins never extend more than halfway from tail-septum 

 to seminal vesicles in E. Jiamata, while they extend three-quarters of 

 the distance, according to Germain and Joubin's drawing, and quite 

 to the anterior end of the vesicles in the Philippine specimens. 

 . The Philippine specimens apparently differ from the type in two 

 points : 



(1) Germain and Joubin state that the ventral neck muscles are 

 composed of longitudinal fibers, together with very fine transverse 

 ones. The transverse fibers are absent in the Philippine specimens. 



(2) The seminal vesicles are figured and described as very small 

 disks lying within the anterior end of the caudal fin. In the Phil- 

 ippine specimens this is not the case, although the vesicles in all 

 specimens were very immature. Their appearance, however, sug- 

 gests that when mature their posterior extremities may touch the 

 caudal fin. 



The five specimens (Cat. No. 17929, U.S.N.M.) were all obtained 

 at 12.07 in the afternoon, May 8, 1909, station D. 5437, off the west 

 coast of Luzon, 15 45/9 north and 119 42/8 east, by an open 

 0000 grit-gauze net towed for 27 minutes in 450 fathoms. 



Genus KROHNITTA Ritter-ZShony. 



Syn. Krohnia LANGERHANS (part). 

 Spadella GRASSI (part). 

 Krohnia STRODTMAN (part). 



KROHNITTA SUBTILIS (Grassi). 



Spadella subtilis GRASSI (1883), p. 23. 



Krohnia subtilis STRODTMAN (1892), p. 22. FOWLER (1905), p. 78; (1906), p. 25. 

 Krohnia padfica FOWLER (1906), p. 24. 

 Eukrohnia subtilis MICHAEL (1911), p. 52. 

 Krohnitta subtilis RITTER-ZAHONY (1911), p. 44. 



Only three specimens were obtained, all of which are immature. 

 Only one is sufficiently well preserved to permit accurate measure- 

 ments : 



Length in mm 9.8. 



Length of tail 35.9 per cent of total length. 



Tail to ventral ganglion 63.5 per cent of total length. 



Length of ventral ganglion 7.5 per cent of total length. 



Length of fin . . 35.1 per cent of total length . 



Width of fin 6.4 per cent of total length. 



Proportion of fin in front of tail-septum 32.7 per cent. 



Length of ovary 8.6 per cent of total length- 

 Width of ovary 2.1 per cent of total length. 



Number of seizing jaws 8-8. 



The teeth could not be counted, but in the two other specimens, 

 which were about the same length, the number of teeth on the right 

 and left sides are 11-10 in one and 12-13 in the other specimen. 

 Similarly, the number of seizing jaws are 8-7 in the first specimen 

 and (?)-7 in the second. 



