48 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Usually stouter than punctata, and distinguished by the lower angle of the 
segment being produced in a nearly vertical spine. 
Caribbean Sea. 300 fathoms ; not scarce (Goés). 
B. plicata p’Orz. 
B. plicata D’OrB., 1839, Voy. Amér. Mérid., V. 62, Pl. VIII. Figs. 4-7. 
B. plicata Br., 1870, For. Tidal Riv., An. Mag. Nat. Hist. (4.), VI. p. 302, Pl. XII. 
Fig. 7. 
B. plicata Gots, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, p. 51, 
Pl. IX. Figs. 487, 488. 
This should more properly be arranged as an allied form of B. punctata, 
for when the folds or grooves of the sutures are reduced to some extent, there 
will be scarcely any characteristic left for distinguishing the two forms. Our 
specimens are not so pointed, but more rounded at the apex of the young stage, 
but that feature may perhaps belong to a more developed or mature stage of 
the initial or larval one. It is generally more broad than B. punctata, but 
specimens with the two margins nearly parallel are also met with. 
Pacific. 730 fathoms. Scarce. 
B. costata vb’Ors. 
B. costata D’ORB., 1839, Voy. Amér. Mérid., V. p. 62, Pl. VIII. Figs. 8, 9. 
B. costata Br., 1884, Chall. Rep., IX. p. 426, Pl. LIII. Figs. 26, 27. 
Being a shallow-water form, but a single specimen has been met with. It has 
a somewhat narrower contour than the form designedin Chall. Rep. B. costata 
D’OrB., 1846, For. Bass. tert. Vienne, p. 239, Plate XXI. Figs. 44, 45, seems to 
deviate somewhat from the type. 
Pacific. 730 fathoms. 
B. caribezea Goss. 
B. costata Go#s, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak: Hdl., XIX. 4, p. 71, 
Pl. IV. Figs. 129-132. 
This species has been recorded under the head of B. costata D’ORB., from 
which it differs through its more compressed outlines, stronger and more regu- 
larly disposed ribs, which have a tendency to be produced to spines at the 
lower margin and particularly at the outer lower angle of the segments. The 
pores are often large and scattered. Often the contour of the test is much 
like the representation of Sagrina pulchella given by d’Orbigny in his For. 
Cuba. It is always of a pygmy size, from 0.30 to 0.50 mm. in height. 
Caribbean Sea. 300 fathoms; not rare (Goés). 
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