274; HENRY B. BRADY. 



arranged with more or less regularity on a triserial plan. 

 The aperture is simple, and usually situated on a produced 

 neck of some sort, either a mere rounded conical projection 

 or, more characteristically, in a tube of greater or less length, 

 terminated by a phial- like lip. The surface of the test is 

 almost invariably ornamented by stride or costfe (continuous 

 or interrupted), spines, bristles, or other exostoses. 



It is, however, on certain divergences from this typical 

 plan of growth, which elucidate the connection ofthe extreme 

 modifications of Sagrina with the generic type, that the 

 chief interest of the forms to be described depends. 



UVIGERINA PORRECTA, H. Sp. PI. VIII, figS. 15, 16. 



Characters. — Test elongate, subspiral ; earlier segments 

 compactly arranged, obscurely triserial; later segments 

 uniserial, alternating irregularly, more or less distinct and 

 interrupted. Surface marked by delicate, irregular, longitu- 

 dinal costae. Aperture produced, tubular. Length -^ inch 

 (0-5 milHm.). 



f\ Habitat. — Off Bermuda, 433 fathoms; off Papua, 155 

 fathoms ; and at a point about 10° north of the Equator, in 

 nearly the same longitude as the latter, 1850 fathoms. 



UVIGERINA INTERRUPTA, 71. Sp. PI. A^III, figS. IT, 18. 



Characters. — Test elongate, subspiral, composed of a 

 number of inflated or subglobose segments, gradually in- 

 creasing in size, arranged around a long axis. Earlier seg- 

 ments combined so as to form a compact spire ; the one or 

 two last formed placed independently, in single irregular 

 series, terminating in a tubular neck. Surface hispid or 

 aculeate. Length -'^ inch (0"5 millim). 



Habitat, — Humboldt Bay, Papua, 37 fathoms. 



G^ewMs— SAGRINA, cPOrhiffny. 



The range of morphological variation in Ucifferina runs 

 nearly parallel to that of Tc.vtularia. The latter genus, 

 which is normally biserial, has subtypical modifications 

 which, on the one hand, may be uniformly triserial, or on the 

 other, may run into uniserial forms; or, taking a dimorphous 

 character, may be spiral, triserial, or biserial in their early 

 stages, and biserial or uniserial in their later growth. 



Tjvigerina has normally a spiral arrangement of its cham- 

 bers^ but in like manner runs into dimorphous forms, and 



