ON A NEW SPECIES OF SCLEROCHEILUS. 



417 



bent chsetse is given to show that it is practically identical with those of the Scotia 

 Bay specimen {cf. text-fig. 1, B, p. 407, and text-fig. 4). 



The first neuropodium bears capillary chsetse of the two types shown in text- 

 fig. 1, C, T). The third notopodium and neuropodium were not excised for examina- 

 tion, but the former contains an anterior row of eight stronger, bent 

 chsetse, like those in the first two notopodia. 



The fourth and following parapoclia, which do not bear stronger, 

 bent chsetae, contain in each ramus capillary chsetse and about half a 

 dozen furcate chsetse identical in form and in the dimensions of their 

 prongs with those described on p. 408, but their shafts are shorter 

 (about '4 mm. long). 



I have recently had the opportunity of examining the type- 

 specimen of Eumenia oculata Ehlers,* which was sent to me from 

 the Konigliches Zoologisches Museum, Berlin, through the kindness 

 of Professor Ant. Collin, and I find that Dr Gravier's specimen does 

 not agree with the type, for in the latter most of the chsetiferous 

 segments are three-ringed, stronger chsetse are not present in the 

 anterior notopodia, and there are no neuropodial cirri. E. oculata 

 has been placed by Professor Ehlers t as a synonym of Oncoscolex 

 dicranochsetus Schmarda, after he had examined the type-specimen 

 of the latter. 



Direct comparison of Dr Gravier's "Eumenia oculata" with the 

 specimen collected in Scotia Bay, allowance being made for the dis- 

 parity in size and age, shows that they belong to the same species. 

 The chsetse of the two specimens exhibit an agreement in structure 

 which is particularly striking, and prove that the specimens are 

 specifically identical. There are only two slight differences between 

 the specimens : — (l) the eyes of the Scotia Bay example are in 

 contact, while those of Dr Gravier's specimen are separate, but a 

 similar variation in the grade of development of the eyes is met 

 with in different individuals of Sclerocheilus minutus (see p. 410) ; 

 (2) the first neuropodial cirrus is borne on the 19th chsetiferous Text-fig. 4. — Bent 

 segment in the Scotia Bay specimen, and on the 21st in Dr 

 Gravier's, but a greater variation is met with in £. minutus, 

 where the first neurocirrus may be borne by the 25th, 27th, 29th, 

 or 31st chsetiferous segment (see p. 413). A minute comparison 

 of the two specimens shows that they are both examples of the same species, 

 S. antarcticus, n. sp. 



* Zool. Jahrb., Suppl. v (1901), p. 265. A fuller description of the specimen (collected at Tumbes, Chile) was 

 given by Professor Ehlers in Festschr. K. Ges. JViss. Gottingen, 1901, pp. 181, 182. 



t Abhandl. K. Ges. Wiss. Gottingen, Math.-Phys. KL, N.F., Bd. iii, No. 1 (1904), p. 51 ; National Antarctic Exped., 

 Nat. Hist., vol. vi (1912), p. 26 ; Deutsche Siidpolar Exped., 1901-1903, Bd. xiii, Zool., v (1913), pp. 537, 538. 



u 



chaeta from the 

 second notopodium 

 of the specimen 

 of "Eumenia 

 oculata. " ( x 300. ) 

 {Cf. text-fig. 1, B, 

 p. 407.) 



