Journal of morphology . 36. Wits on, del. BMeisel. 626 WILSON. PLATE XXXII.[All from preparations ; 270 diameters.] Fig. 37. 32-celled stage, bilateral form /, lower pole. Fig. 38. The same specimen from the side. Fig. 39. 32-celled stage, strict bilateral form /, from one end. [CompareHatschek, Taf. I, Fig. 10.] Fig. 40. 32-celled stage, slightly modified radial form, lower pole. Fig. 41. Sixth cleavage, bilateral form /, viewed obliquely from below. Originof third group of micromeres. Fig. 42. The same specimen from the side. Note complete irregularity of thecleavage-planes in th

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Journal of morphology . 36. Wits on, del. BMeisel. 626 WILSON. PLATE XXXII.[All from preparations ; 270 diameters.] Fig. 37. 32-celled stage, bilateral form /, lower pole. Fig. 38. The same specimen from the side. Fig. 39. 32-celled stage, strict bilateral form /, from one end. [CompareHatschek, Taf. I, Fig. 10.] Fig. 40. 32-celled stage, slightly modified radial form, lower pole. Fig. 41. Sixth cleavage, bilateral form /, viewed obliquely from below. Originof third group of micromeres. Fig. 42. The same specimen from the side. Note complete irregularity of thecleavage-planes in the micromeres. Fig. 43. 64-celled stage, from the side. Fig. 44. The same specimen from lower pole. Slightly modified bilateralform /. Fig. 45. 128-celled stage, bilateral form /, from lower pole, showing fourthgroup of micromeres. Fig. 46. 256-celled stage, from lower pole, mixed form. Designations of themacromeres arbitrary. Fig. 47. Seventh cleavage, bilateral form /, from the side, showing origin offourth group of mi

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