. Biometrika. Biometry; Biology. A. 0. DiMON 33 and apical anglo vary inverseli/ as lerigth. Hence " spxirious coi-relation" occurs, and \ve should (/ priori, cxpect index and angic to be ncgatively corrclatcd with length and posiüvcly corrclatcd with cach other. The corrclatioii of dianictcr and length would havo to bc dctermined in Order to nieasure the ainouiit of " sjuiridus ciiri'i'latioii " lictwecn index and length. (10) Descriptioii of Ahnoriiutl Siiail. About one hundicd shells froMi caoh localitv wcrc incasured wliile the aninials inhabiting thetn wcrc still
. Biometrika. Biometry; Biology. A. 0. DiMON 33 and apical anglo vary inverseli/ as lerigth. Hence " spxirious coi-relation" occurs, and \ve should (/ priori, cxpect index and angic to be ncgatively corrclatcd with length and posiüvcly corrclatcd with cach other. The corrclatioii of dianictcr and length would havo to bc dctermined in Order to nieasure the ainouiit of " sjuiridus ciiri'i'latioii " lictwecn index and length. (10) Descriptioii of Ahnoriiutl Siiail. About one hundicd shells froMi caoh localitv wcrc incasured wliile the aninials inhabiting thetn wcrc still alivc, and of this luuaber one aninial was seen with the left tentacle double and boaring two eyes, as in Figiire 4. All the rest of tht^ s])ecinicus wcrc killed before. Fig. 4. Freehand outline sUetcli uf snail froni locality 2. measuring, and as the foot was retracted, the tentacles could not be seen. No other sport of any kind was observed. ('S)4) has reported cases of doubling of tentacles and eyes as follows: Patella vidgata, tentacle and eye repeated on the left side ; Flij/sa acuta, riglit tentacle bitid ; three cases of a snpernumerary eye without donbling of the tentacle; and one case {subemarginula) where both eye-stalks were double, and eaeh bore a supernumerary eye. This condition, then, would secm to be not uiicomnion, and is mentioned and figured merely as adding one more to the cases of siniilar abnormality alreail}- known. Suminarij. I. Therc are in Cold Spring Hai'bor and vicinity two species of Nassa, with no forins intermediate in all characters, though tlieir habitats ovei'lap. II. When eompared with the normal types for the species, both thcse species are depauperatc, bcing smaller, more globose, with a larger aperture in proportion to their length, more obtuse apical angle; and in the case of N. obsületa, fewer whorls. This dcpauperization is connected with the .slight density of the water in Cold Spring Harbor, as eompared with the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbiology, bookyear1902
