100 ON MACLOVIA IKICOLOR (MONTAGU). 



*10. Maclovia gigantea (Qfg.), Saint-Joseph, 1888. Les Annt'lides 

 Folycbetes des cotes de Dinard, Ann. Sci. nat. (7), V., p. 30, PI. IX. 

 f. 92-95. 



Madovia is here regarded as a sub-genus of Arabella, characterised 

 by the presence of five pairs of superior jaw-pieces and tripartite 

 sustentacular apparatus. There are four eyes in the head in a trans- 

 verse row. 



The following will serve as a brief diagnosis of our worm : — 



Corpus lumbriconereiforme, long, usque ad 600 mm. ; lat. c. 5 mm. 



Prostomium sub-ovate, oculis 4 transversa serie. 



Segmenta hnccalia bina, fere similia. 



Pharetrae setarum in lingulas postero-inferiores carneas productae. 



Cirrus dorsalis rudimentaris, fasciculo acicularum (5-7) baud emer- 

 gentium praeditus. 



Setae flavae, fere similes, acuminatae, plus minusve limbatae, geni- 

 culatae, saepe crenatae, paucae (c. 12). 



Aciculae flavae, plures (6-7). 



Segmentum anale lobis brevibus 4. 



Maxillae T. inaequales (sinistra paullo major) unciformes, basi serrata 

 dentibus c. 10 ; II. inaequales, dextra fere duplo longior dentibus 12-14, 

 sinistra dentibus 6-7 ; V. hamuli singuli. 



Radices maxillarum (sustentacular apparatus) 3. 



Laminae ventrales nigrae edentatae. 



The importance of the identification of the above species lies in the 

 fact that it cohabits with a true Luvihriconercis, which bears a striking 

 superficial resemblance to the Maclovia, but does not attain to the length 

 of the latter. Tlie two forms have often masqueraded under a common 

 denomination. 



The Lumhriconcreis is probably co-specific with L. latreilli (Aud. Edw.) 

 and may possess a length of about 6 inches. 



It must be left to the future to decide upon the respective merits of 

 L. latreilli and L.fragilis. 



London, May VMh, 1900. 



