Polychaeta. 269 



In his recent diagnosis of this genus, Prof. Mcintosh speaks 

 of " the median and lateral tentacles springing from the front as in 

 Lepidonotus." It M\as Grube ^ who first drew attention to the 

 divergent series of Polynoids typified respectively by Lcpidonotu^i 

 and Ilarmotlwe. In Prof. Mcintosh's monograph the reader is left 

 in doubt as to which series the genus is to be assigned, and on 

 turning to the figure of the head (PL XXVIII,, fig. 15) it seems to me 

 that the median and lateral tentacles do not arise from the frontal 

 border as in Lepidonotus. 



In a still more recent memoir on the Aphroditidae written 

 by M. Darboux ^ we find the genus Malmgrcnia included among 

 the synonyms of Harmothoe itself. Under these circumstances 

 it is unfortunate that there should be ambiguity in the defini- 

 tion and illustration of the genus. The bases of the tenta- 

 culum and antennae in Malmgrenia are contiguous, but the latter 

 are inserted at a distinctly lower level. 



4'. Malmgrenia. crassicireis. 



(PI. XLIL, figs. 3-4, and PI. XLIV., figs. 5 and 6.) 



Elytra reniformia brunnea albolineata striis candidis duabus longitudinalibus ; 

 setae ventrales apice bidentato denticulo accessorio intermedio ; cirri ventrales 

 tumidi subulati. 



The two white stripes upon a dark madder-brown background 

 on each elytron give this species a characteristic appearance totally 

 unlike anything else in the collection. Seen from below, the whitish 

 fleshy ventral cirri convey an equally distinctive impression. When 

 the elytra are removed, the intensely white prostoniium and the 

 whitish elytrophores stand out prominently from the general dark 

 madder-brown ground colour. 



The largest 'specimen was unfortunately mutilated behind, only 

 thirty-one segments being preserved with the fragment, which 

 measured 17 mm. in length and 6*5 mm. over the setae. A com- 

 plete specimen, 1-1 mm. long by 4*5 mm. wdde (over the setae), had 

 forty segments. 



The dorsal setae are much shorter and stouter than the ventral 



^ Grube, E. : ' Bemerkungen iiber die Familie der Aphroditeen III., Polyonina,' 

 see p. 51). Jahresher. Schles. Oes., 1876 (Breslau, 1876), 



- Darboux, J. G, : ' Eecherches sur les Aphroditiens,' Bull. Sci. France ct 

 Belyicjue, XXXIII, 1900, see p. 106. 



