The Crixoids from Dr. 8. Hock's Kxpkditiox to Jai'AX MM 4. \',U 



ever, has a conical Cd, while tiie above-described species, like I'uxo- 

 metra panpera, has a discoidal one. {IrUlometra has smoodi arms and 

 at least 13 segments on P, — P.^.) — To the relation between the rela- 

 ti\e length of the proximal pinnules is, generally, attached a rather 

 gi-eat value in judging the genera within the Antedunid family. \\'lien 

 characterizing the genus Toxometra A. H. Clark says that P, should 

 be the longest p. The case in question shows that one must Ije ralhei- 

 cautious in using such a charactei- as a generic mark. If my species 

 really belongs to Toxoriidra then P, is the longest pinnule only in 7'. 

 j)aupera and may not be used as a mark of genus. A comparison 

 between the different species described as 7'. j)aMy>era shows, moreovei'. 

 that within this species too there is I'ather great variability in the re- 

 lative length of the proximal pinnules. The largest specimen has Pj 

 \'y. 5,5 mm., P.^ 1(3; 7,5 mm. and P3 22; 12 — 13 nun., the smallest one 

 with an arm-length of 8(1 mm. has Pj 12; 4.5 mm. P.^ 14; (i mm. P3 

 17; 7 — 7.5 mm. \\'ith shorter arms we therefore get a proportionally 

 greater abbreviation of P3 than of Pj and P., within this species. (Cf. 

 p. 70). 1 have also demonstrated the same general rule concerning 

 P., in Cyllometra imlchella. 



Nevertheless, because of the following facts, 1 have not thought 

 the specimens in the Bockian collection to be young forms of T. j>au- 

 pera. 1) The cirrals are somewhat shorter than in the species men- 

 tioned (if we had been concerned with a young foini, they ought to 

 be longer). 2) The distal pinnules are longer than in T. punpeva \\\wn 

 compared with the arm-length. 3) The genital glands are rather well 

 developed. 4) The photo in the Siboga work shows that T. paujiera, 

 though very much larger than T. a>(juipinna, has smaller prominences 

 on the Br-segments (if the last-mentioned species had been a young 

 form, the condition ought to have been (he reverse), and 5) the 

 geographical distribution is rather different, as T. paiipera is only noted 

 from the Sunda Islands and the Philippines, 



