. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Middle Pennsylvanian Pelycosaurs • Reis2 31 Archaeothyris florensis n. sp, Etijinologij. Greek archaeo, ancient, plus thijris, window, in reference to the earliest evidence of a temporal opening. Florensis, from the name of the locality, Florence. Ilulotype. Museum of Comparative Zool- ogy, Harvard, MCZ 4079, block , partial skull, several vertebrae, humerus, cervical ribs. Parah/pcs. MCZ 40S0, block A, pelvis, sacral vertebra, axis; MCZ 40S1, block B, caudal vertebrae; MCZ 4082, block B, an- terior dorsal vertebr
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Middle Pennsylvanian Pelycosaurs • Reis2 31 Archaeothyris florensis n. sp, Etijinologij. Greek archaeo, ancient, plus thijris, window, in reference to the earliest evidence of a temporal opening. Florensis, from the name of the locality, Florence. Ilulotype. Museum of Comparative Zool- ogy, Harvard, MCZ 4079, block , partial skull, several vertebrae, humerus, cervical ribs. Parah/pcs. MCZ 40S0, block A, pelvis, sacral vertebra, axis; MCZ 40S1, block B, caudal vertebrae; MCZ 4082, block B, an- terior dorsal vertebrae; MCZ 4083, blojk B, assorted postcranial elements; MCZ 4084, block B, caudal xcrtebrae, articulated; MCZ 4085, block B, lower jaw el(Miients, frontal; MCZ 4086, l)lock C, metacarpals; MCZ 4087, block C, presacral \'ertebrae; RM 10056, block D, maxilla, dentary, presacral and caudal vertebrae, interclavicle, cal- caneum. Horizon and locality. Morien Group, within 25 feet above the Lloyd Cove coal seam, equivalent to the Westphalian D ol Europc\ Dominion Coal Co., strip mine No. 7, two miles north of Florence, Cape Br(>t()n County, Nova Scotia. Diaii,nosis. Same as for genus. Description. Skull: On the basis of the material from block B (MCZ 4079) and D (RM 10056), a reconstruction of the skull has been attempted (Fig. 2). The skull resembles that of Ophiacodon except that the antorbital region is not strongly elon- gated. The approximate length of the skull is 92 mm; the orbit is about 21 mm in diam- eter. The posterior rim of the orbit is 31 mm from the posterior tip of the quadrate. The maximum height of the skull (25 mm) is reached in the region of the orbit. The skull is relatively narrow and has a well- developed temporal opening bounded by the postorbital, sc^uamosal, and the jugal. The sculpturing resembles that seen in other pelycosaurs. It is more pronounced on the dorsal surface than on the lateral. Of the skull roof (Fig. 3), the right frontal, postfrontal, pa
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
