310 ON A NEW SPECIES OF SCLKROGHE1LUS 



DESCRIPTION OF PLATE. 

 List of Reference Letters. 



AN. C. Anal cirrus. 



E. Eye. 



Mo. Mouth. 



NEUR.' First neuropodiuni. 



NKUR. S|J Tliirty-nintli neuropodiuiu. 



NEUR. C. Neuropodial cirrus. 



NOT. Notopodium. 



NoT. 1 First notopodiuni. 



NoT. 40 Fortieth notopodiuin. 



Nuc. O. Nuchal organ. 



PER. Peristomiuni. 



PR. Prostomium. 



S.O. Lateral sense-organ. 



TENT. Tentacular process of prostoniium. 



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

 of prostomium, peristomium, and Hrst four chpetiferous segments. Tlie prostoniium is retracted into and 

 partially hidden by the peristomium. For further description see pp. 293, 294. (x 25.) 



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



Fig. 3. Sclerocheilus (intarctii-us, n. sp. Para-type ( = " Eumenia oculata " of Dr GBAVIBK) from Petermann 

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

 everted nuchal organs. For further description see p. 304. ( 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 chsetiferous 

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

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

 remaining. For further description see p. 294. ( x 30.) 



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

 Immediately ventral to the notopodiuni 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. 294, 295. ( x 30.) 



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

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

 For further description see pp. 298, 299. ( x 35.) 



Fig. 8. Sclerocheilus minutus Grube. Specimen 18'5 mm. long, from 1'lymouth. Lateral (somewhat 

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



Fig. 9. St'li'i'tH'lteilus minntug Grube. Specimen 10 mm. long, from Saint- Vaast. Ventral aspect of 

 posterior end, showing two chsetiferous segments, another segment recently formed and as jet achcetous, and 

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



(HOY. SOC. KDIN. TKANK., VOL. if, 422.) 



