382 J. WILFRID JACKSON ON 
Dallininze and Magellaninz, were geographically separated into two provinces, one 
(Dallininee) being restricted to boreal, the other (Magellaninz) to austral seas 
(ScHucHERT, in Zittel, 1900, p. 329). 
It can now be shown that the sub-family Dallinine is well represented in the 
austral region. 
This discovery is of still further interest as being highly confirmatory of Datu’s 
observations when first describing this and two other species of Macandrema from the 
Gulf of Panama (Dati, 1895, p. 721). 
He remarks: ‘‘ As regards the partly austral species about to be described, since 
there is no means of deciding whether their development agrees with those forms refer- 
able to Magellaninze or not, and as the adult shells exhibit no characters which could 
not be regarded as diagnostic of a genus different from Hudesia,* I feel obliged for the 
present to refer them to that group. It may be observed that there is nothing to 
prevent the free migration of northern forms into the South Pacific along the coast of the 
Americas. The writer has already the evidence to show that several species, in deep 
water, do extend from Bering Sea south to the vicinity of the Galapagos Islands and, 
in the case of one species, Solemya johnsoni, Dall, more than a thousand miles further 
south ; with the known great range of many brachiopods, there would be no apparent 
reason why species of the Panamic region, for instance, belonging to the northern type 
of development, should not extend their range southward, if opportunity arose. I 
regard it then as quite likely that the species I refer to may be Macandrevian in their 
development as well as in their adult state, though, for the mass of characteristically 
austral species, the reverse might be the case.” 
The prescience of this eminent American author has thus been amply justified. 
Macandrevia diamantina was originally described from two specimens obtained in 
deep water, 1175 fathoms, mud, Gulf of Panama; bottom temperature 36°°8 F., and 
was again met with later in 2222 fathoms, mud, off Sechura Point, Northern Peru; 
temperature 35°°2 F. 
The discovery, therefore, of this species in deep and cold water off the coast of the 
Antarctic continent is highly interesting as showing a very considerable range 
southward. 
Furthermore, it forms a connecting link in the distribution of the genus Macan- 
drevia, which now ranges from the North Atlantic (MW. cranium), Davis Strait 
(M. tenera), via the Gulf of Panama (three species, viz. M. americana, M. craniella, 
and M. diamantina), Peru (M. diamantina), West Patagonian coast (I. americana), 
Coats Land (M. diamantina), to Kaiser Wilhelmland II., Antarctica (MM. vanhdéffen). 
Though the distance between the recorded stations for M. diamantina appears to be 
so great, it is not at all improbable that it will ultimately be met with in. other 
stations off the long South American coast as further dredgings are carried out in that 
area. Macandrevia americana, one of the Panamic species, has already been found 
* Day regarded Macandrevia as a sub-genus of Hudesia. 
