262 L^STMATONIOE PRODUCTA. 



Reproduction. — Ova of considerable size are present in examples dredged by Dr. 

 Gwyn Jeffreys off North Unst in June, 1867. 



Kinberg (1857) characterised this species as having a rounded cephalic lobe, tri- 

 partite from two curved sulci, filiform tentacle longer than the palpi, and the median 

 elytra reniform. It was procured on the western and northern shores of Scandinavia. 



Ehlers (1875) considered the Lsetmatonice Kinbergi of Baird as different from 

 Kinberg's L. filiformis, but, as previously stated, there is no reason to doubt their 

 identity. 



Ehlers (1887), in his 'Annelids of the United States Expeditions/ considers, as he did 

 in the former publication (' Annel. of the 6 Porcupine ' ') that he is still dealing with a 

 new species fide Baird. Only a single form appears to occur in British seas, and it extends 

 to Norway and the American coast. His figures are the work of an artist, and thus the 

 scientific accuracy is not beyond doubt, as a glance at the dorsal spine of his pi. viii, 

 fig. 3, demonstrates. The peculiar flattening of the main part of the shaft, and the 

 characteristic narrowing of the tip, have been overlooked. This form, however, may be a 

 variety of L. producta, allied to L. prod., var. benthaliana. His description gives nothing 

 diagnostic. 



2. LiETMATONiCE pboducta,- var. Britannica. 



Specific Characters. — Body ovate-oblong, of a pale flesh-tint, and devoid of dorsal 

 felt. Scales pale, their reticulate cordate structure being better marked than in any 

 other form. Segments forty-five. Head triangular ; ocular peduncles globular at the 

 tip, narrowed inferiorly at the peduncle; no eyes. Lateral process at the posterior 

 part of the head smaller than in the typical forms. Papillse of the angular facial tubercle 

 more lobate than in L. producta. Grlochidiate bristles with four recurved fangs, besides 

 the process at the base of the terminal spear- tip. Ventral bristles with stiff er basal and 

 more slender distal pinnse. 



Synonym. 



1894. Lsetmatonice producta, Flor. Buchanan. Proc. Eoy. Dubl. Soc, vol. viii (n. s.), ii, p. 169. 



Body more or less oblong, of a pale flesh-tint, devoid of dorsal felt, scales pale ; forty- 

 four bristled segments, which increase to the middle or behind the middle of the body, 

 and again diminish posteriorly, though the latter region is somewhat blunt. The centre 

 of the head is more or less triangular, with a prominent swelling, and bearing in front 

 the two ocular peduncles, which are globular at the tip, but have a distinct peduncular 

 portion, thus differing from those of var. Willemoesii, which are more or less sessile, and 

 without a trace of eyes. Those of L. producta are more elongated. The lateral process 

 towards the posterior part of the head is much smaller than in L. producta from Kerguelen. 

 It forms a lobate flattened process in the latter, and nearly reaches the base of the 

 ocular peduncles. On the other hand, in the British specimens it is only a small papilla, 



