CUSHMAN: WOODS HOLE FORAMINIFERA. 29 
Williamson describes this as a variety of PoJymorphina lactea. The 
specimen which he figures and describes has a peculiar flattened, 
concave shell mass at one side. The form has been given little atten- 
tion since that time. From material dredged by the Phalarope in the 
shallower water of Buzzards Bay were found specimens which very 
closely agree with those of Williamson. In all cases they were attached 
to rather large sand grains. The form of the shell in our specimens 
and in those figured by Williamson is much shorter than in the ordinary 
types of P. lactea and the peculiar habit of fixation with the resulting 
development of the concave plate-like portion seems to make it worthy 
of specific rank. Specimens were dredged by the Phalarope at 
stations 133 and 148. 
Polymorphina rotundata (Boniemann). 
Guttulina rotundata Bomemann, '55, p. 346, pi. 11; pi. 18, fig. 3. 
Polymorphina rotundata Reuss, '70, p. 487, no. 14; Brady, '84, p. 570, pi. 
73, fig. 5-8. 
This species seems to be rare in a living state, but a few specimens 
obtained during the dreciging seem referable lo it. These were from 
Phalarope station 146 and Fish Hawk station 7728. It may be at once 
distinguished from any of the variations of P. lactea by its shorter 
form and its close set chambers. 
ROTALIDAE. 
Pateliina corrugata Williamson. 
Plate 5, fig. 3. 
Pateliina corrugata William.son, '58, p. 46, pi. 3, fig. 86-89; Brady, '84, p. 
634, pi. 86, fig. 1-7. 
A single specimen of this interesting and beautiful species was 
obtained. It was fomid in material scraped from the surface of a 
large shell of MytUus edulis taken from the outer piles of the dock at 
Woods Hole, July 19, 1905. The specimen was dra'wii to show the 
characteristic thickenings which project inward from the peripheral 
border of each chamber. Many other Mytilus shells were searched 
after this species was discovered but not another specimen could be 
found. It should be found more frequently with further search for 
it is not uncommon in the littoral zone along European shores. 
