422 



ON A NEW SPECIES OF SCLEROCHEILUS 



DESCRIPTION OF FIGURES. 



List of Reference Letters. 



An. C. Anal cirrus. 



E. Eye. 



Mo. Mouth. 



Neur. 1 First -neuropodium. 



Neur. 39 Thirty-ninth neuropodium. 



Neur. C. Neuropodial cirrus. 



Not. Notopodium. 



Not. 1 First notopodium. 



Not. 10 Fortieth notopodium. 



Nuc. O. Nuchal organ. 



Per. Peristomium. 



Pr. Prostomium. 



S.O. Lateral sense-organ. 



Tent. Tentacular process of prostomium. 



Fig. 1. Sclerocheilus antarcticus, n. sp. Type-specimen from Scotia Bay, South Orkneys. Dorsal aspect 

 of prostomium, peristomium, and first four chsetiferous segments. The prostomium is retracted into and 

 partially hidden by the peristomium. For further description see pp. 405, 406. ( x 25.) 



Fig. 2. Ventral aspect of same specimen. ( x 25.) 



Fig. 3. Sclerocheilus antarcticus, n. sp. Para-type ( = " Eumenia oculata" of DrGRAViER) from Petermann 

 Island. Dorsal aspect of prostomium, peristomium, and first four chsetiferous segments. Note the two 

 everted nuchal organs. For further description see p. 416. ( x 35.) 



Fig. 4. Ventral aspect of same specimen. ( x 35.) 



Fig. 5. Sclerocheilus antarcticus, n. sp. Type-specimen. Ventral aspect of the 39th-43rd chaetiferous 

 segments and the anal segment. Neuropodial cirri were probably originally present on the 41st and 42nd 

 chaetiferous segments, but have been lost therefrom. The anal cirri are also reduced in number, only one 

 remaining. For further description see p. 406. ( x 30.) 



Fig. 6. Sclerocheilus antarcticus, n. sp. The 24th parapodium of the type-specimen, posterior aspect. 

 Immediately ventral to the notopodium is the papilla bearing the lateral sense organ ; ventral to this is a 

 much larger papilla the epidermis of which is glandular. For further description see pp. 406, 407. ( x 30.) 



Fig. 7. Sclerocheilus minutus Grube. Specimen 13'5 mm. long, from Plymouth. Dorsal aspect of 

 prostomium, peristomium, and first two chaetiferous segments. The right and left nuchal organs are everted. 

 For further description see pp. 410, 411. ( x 35.) 



Fig. 8. Sclerocheilus minutus Grube. Specimen 18 - 5 mm. long, from Plymouth. Lateral (somewhat 

 ventro-lateral) aspect of peristomium and first chsetiferous segment. ( x 40.) 



Fig. 9. Sclerocheilus minutus Grube. Specimen 10 mm. long, from Saint-Vaast. Ventral aspect of 

 posterior end, showing two chaetiferous segments, another segment recently formed and as yet achsetous, and 

 the anal segment with four cirri. ( x 80.) 



