(tatty Murine Luhorutori/, St. Andrews. \?tl 



aro more or loss a^jj^lomcratcMl on stones or shells. Corfjiin 

 8|)fciinciis liave the hiaiichiie coloured ri'd at the extremities 

 — an aceideiital condition. The colhir-hristles have the wel) 

 at the hjise of the tip with lar;;e teeth (two (jr throe prominent) 

 and with a few capillary hristles. There is no operenlnm. 

 Till! nneini have nnmerons teeth. He distinj^uishes S.dijsleri, 

 llnxlev, from the forci^oinj; hy the nnmerous fine teeth on 

 the i)asal weh of the eollar-l)ristlos. All the s|)oeimens had 

 sansajje-likc eellnlar masses at the tips of the branchial 

 filaments. lie was of opinion that the S. wdijiratrid', 

 ('lapar^de, was the same species. He never encountered a 

 true representative of this sjjecies, which, he says, is distin- 

 guished froui ^S. di/s'teri by the absence of the ciilarjjjcmenfs 

 at the tips of the branchial filaments, and adds, strange to 

 say, that the tubes are often intertwined with those of 

 iilof/rana iin/ilcra. 



.1. ll.Orton* (191 •) states that the common species of 

 *' Filoifrana carries ripe ejrgs ami troehosphercs at an aye 

 probably less than 4 months, having grown throujih tlie 

 summer. About the same time another experiment yielded 

 specimens with fully-developed eggs at an age not greater 

 than 10 weeks and 1 days. Later in the year fnll-si/rd 

 specimens with l)uds had an age not greater than 4 weeks 

 aufl 2 days. There can be little doubt, therefore, that, in 

 this species there is an alternation of generations, the 

 summer forms producing eggs and sj)erm, and the autumn 

 ami winter ones [uodiicing buds.'' 



{h) Fau.nistic. 



In order to give a satisfactory view of the remarkable 

 xariations of PI tin/ ran a, it is necessary in the first instance to 

 glance at the condition of the specimens from tlie several 

 grounds, which range Irom Shetland to the Channel Islands 

 in IJritain, and elsewhere from diverse distant localities 

 streteliing abnost from pole to pole f. 



In those from IMymouth no operculum has been seeii 

 up to date. In an example with a bud the b:ancl.i:e had 

 short pinn;e, but the tips had sausage-like enlar;iements ; 

 the anterior region had seven lateral bristle-tnfts Ixsides 

 the collar-tnt>, two segments succeeded the anterior region 

 without bristles; tiiirteen bristled segments fullowed ; then 

 the bud, the first two segments of whicli had no bristles, 

 and twenty-t'irce with bristles succeeded, two papilhe occur- 

 ring posteriorly. Its branchia- were simple filaments. In 



• .lonr. .M. M. .\. v..l. x.n. .'{HJ. 



t Thnso from tin- area of the (?Iyde was sent by y\r. T.. Kinouf of tlio 

 Musfinii r:h1 I.aboratorv ftt IJntln-snv. 



