264 MESSRS. E. HERON-ALLEN AND A. EARLAND ON THE 



239. Polymorphina lactea (Walker & Jacob). 



Serpula lactea, Walker & Jacob, 1798, AEM. p. 634, pi. xiv. fig. 4. 



Polymorphina lactea, Brady, 1881, PC. p. 559, pi. Ixxx. typical, fig. 11 ; var. fig. 14. 



19 Stations. 



Widely distributed, sometimes common, but the specimens as a whole run small, the 

 only Stns. where a good series showing all stages of growth occurs being Stns. 7 and 22. 

 No fistulose specimens. 



240. Polymorphina oblonga (Williamson), H.-A. & E. 



Polymorphina lactea, var. oblonga, Williamson, 1858, RFGB. p. 71, pi. vi. fig. 149. 

 „ oblonga, Heron- Alien & Earland, 1913, CI. p. 100, pi. viii. fig. 17. 



7 Stations. 



Very rare and, except at Stn. 3, nearly always very small. Many of the specimens 

 have an entosolenian tube, which we take to be a sign of depauperation. 



241. Polymorphina COllcava (Williamson), H.-A. & E. 



Polymorphina lactea, var. concava, Williamson, 1858, RFGB. p. 72, pi. vi. figs. 151, 152. 



„ concava, Heron-Allen & Earland, 1908, etc., SB. 1909, p. 431, pi. xvii. fig. 6. 



2 Stations. 



Very rare. A few good specimens at each Stn., all detached. 



242. Polymorphina sororia, Reuss. 



Polymorphina (Guttnlina) sororia, Rcuss, 1803, FCA. p. 151, pi. ii. figs. 25-29. 

 sororia Brady, 1884, FC. p. 562, pi. lxxi. figs. 15, 10. 



1G Stations. 



Widely distributed, but never very abundant. Taking P. sororia as the type of the 

 pyriform Polymorphina?, Reuss's species shonld properly be confined to the compressed 

 forms, and d'Orbigny's earlier species, P. gutta (d'O. 1826, TMC. p. 267. No. 28, pi. xii. 

 figs. 5, 6, Modele No. 30) and P. (Pi/ruliiia) acuminata (d'O. 1840, CBP. p. 43, pi. iv. 

 figs. 18, 19) being used for the round and aborally pointed varieties respectively. The 

 differences are, in our opinion, too trivial for consideration, and the compressed type 

 being by far the most abundant we prefer to separate all such forms under Reuss's name 

 P. sororia. 



Typical P. sororia occurs practically at every Stn. Round (=P. gutta) forms at 

 Stns. 2, 4, 12, 18, and 20, the best at Stn. 20. Pointed (=P. acuminata) forms are 

 rarer, occurring only at Stns. 4, 13, and 21, the best at Stn. 21. 



243. Polymorphina rotundata (Bornemann). 



Gultulina rotundata, Bornemann, 1855, FSH. p. 316, pi. xviii. fig. 3. 

 Polymorphina rotundata, Brady, 1881, FC. p. 570, pi. lxxiii. figs. 5-8. 



13 Stations. 



Generally distributed and fairly common at some Stns. The short cylindrical form, 



