of the fishery Board for Scotland. 259 
Herrmannella rostrata, Canu (1891) | = Lichomolgus agilis, T. Scott 
(1892). Firth of Forth. ] 
The structure and armature of the inner branches of the fourth pair 
in Herrmannella are somewhat similar to those of Sabelliphilus, but the 
first two joints of the anterior antenne are cylindrical and not swollen as 
in that genus. 
Modiolicola insignes, Aurivillius. (Firth of Forth.) 
This species of the Lichomolgidz somewhat resembles both Sabelliphilus 
and Herrmannella in the structure and armature of the fourth pair of 
feet. It also resembles Herrmannella in the form of the anterior 
antenne, but it differs from Sabdelliphilus in the first two joints of the 
anterior antenne being cylindrical and not dilated; and it differs from 
Herrmannella in the anterior foot-jaws (the external second-maxille) 
being furnished with only one internal smooth seta on the basal part of 
the second joint; whereas in Herrmannella, there are two sete on the 
inner part of the base of the second joint of the anterior foot-jaws, one 
seta being comparatively short and smooth, and one elongate and denticu- 
late. 
Lichomolgus arenicolus, Brady, is evidently not a true member of the 
genus Lichomolgus. In this species both branches of the fourth pair are 
three-jointed, and their armature is very similar to that of the second and 
third pairs; but it varies also in other structural details, and to such an 
extent that it cannot satisfactorily be placed in any of the genera I have 
referred to. The same may be said of an interesting species discovered 
some time ago by I. C. Thompson of Liverpool, and described by him 
under the name of Lichomolgus maximus; the species was found living 
as a mess-mate within the shell of the large scallop, Pecten maaximus. 
That this is not a true Lichomolgus, according to the definition of the 
genus I have already referred to, will be at once apparent from the follow- 
ing quotation from Mr Thomson’s description of the species. He says :— 
‘ The first four pairs of swimming-feet have both branches three-jointed.’ 
es gee) ‘Tt agrees with Lichomolgus agilis’ (= Herrmannella rostrata, 
Canu) ‘in having the inner branch of the fourth pair of swimming-feet 
‘ three-jointed.’ It is evident from this description, and independent of 
other structural differences, that Lichomolgus maximus is not, any more 
than Lichomolgus arenicolus, a true member of that genus; but the 
question as to which genus they should be assigned, to secure for them a 
satisfactory resting-place, is a matter requiring further study, It is quite 
possible that their structural details may not meet the conditions of any 
described genus. Lzchomolgus maximus, however, appears to have a 
closer affinity with MJodiolicola Aurivillius, than with any of the other 
genera referred to here. 
Pseudanthessius thorellic (Brady and Robertson). 
1875. Lichomolgus thorellii, Brady and Robertson (10), p. 197. 
1880. Lichomolgus thorelliit, Brady (8), vol. iii, p. 47, pl. 
Ixxxviii. figs. 1-9. 
1893. Lichomolgus thorellii, I. C. Thompson (33), p. 33, pl. xxv. 
fig. 2c, 
Habitat.—Off St Monans. Scarce. 
This appears to be one of the rarer species of Lichomolgus. I find 
- comparatively few records of its occurrence in the British seas. Dr Brady 
obtained it at one or two places off the Durham and Yorkshire Coasts. 
Mr I. C. Thompson obtained it at Port Erin, Isle of Man; Moray Firth 
amongst Fillograna (A. 8.); these, with the present record of its occurrence 
in the Forth, are the only British records for this species known to me. 
