. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 222 rJtJLLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. tral and accessory stylets exhibit the same braided appearance, and are of the same size and shape when mature. Variations in size of central stylet and its basis in several individ- uals are given below: Length of central Len gtli and width of Numb er of stylets in stylet 1 uasis lateral pouches .045 mm. .045 mm . X .021 nan. 3 — 3 .063 .048 X .023 3 3 .081 .072 X .033 2 3 .081 .075 X .033 3 — 2 .084 .084 X .039 3 — 3 .087 .078 X .03« •) 0 .090 .078 X .03fJ 4 — 4 .090 .0
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 222 rJtJLLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. tral and accessory stylets exhibit the same braided appearance, and are of the same size and shape when mature. Variations in size of central stylet and its basis in several individ- uals are given below: Length of central Len gtli and width of Numb er of stylets in stylet 1 uasis lateral pouches .045 mm. .045 mm . X .021 nan. 3 — 3 .063 .048 X .023 3 3 .081 .072 X .033 2 3 .081 .075 X .033 3 — 2 .084 .084 X .039 3 — 3 .087 .078 X .03« •) 0 .090 .078 X .03fJ 4 — 4 .090 .078 X .042 2 — 3 The specimen with the smallest stylet apparatus included above measured but 1 cm. in length, while several with the lai-gest stylets were 15 to 20 cm. long. As a general rule the larger indi- viduals have the larger stylet and basis, but the correlation in size is not very exact, and is subject to many exceptions. The basis averages a trifle shorter than the stylet itself, and the largest stylet measured is just twice the length of the smallest. All the Californian specimens examined, whether from Monterey Bay or San Pedro, differ therefore from most individuals col- lected in Alaska in the number of lateral stylet pouches as Avell as in the number of accessory stylets. Four pouches are com- monly found in Alaska specimens, but I have not yet seen any individual from California with more than two. In Alaska there are commonly 6 to 10 accessory sty- lets in each lateral pouch (Coe, : 01, p. 34), while, as shown above, 2 to 4 is the rule in California. The largest individual which T examined in California, however, measured but 25 cm., while I have collected specimens in. Fig. 38.— Paranemertes pere- grina. Outlines of central stylets and bases, showing peculiar sjurally grooveil appearance of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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