. Fig- 33- Opbiolebella biscutifera (G. A. Smith). Part of oral side {a) and dorsal side {b-c) of two different specimens, one without, the other with granules, xio. there is only one gonad in each bursa, placed at the interradial side. At a size of 4 mm. diameter also an adradial gonad is present; this latter gonad would seem to be male at first, the young eggs appearing therein a little later than the sperm cells. At a diameter of 7 mm. there are two gonads at the interradial, one at the adradial side of the bursa, all of them containing both male and female genital products. At this size yo
. Fig- 33- Opbiolebella biscutifera (G. A. Smith). Part of oral side {a) and dorsal side {b-c) of two different specimens, one without, the other with granules, xio. there is only one gonad in each bursa, placed at the interradial side. At a size of 4 mm. diameter also an adradial gonad is present; this latter gonad would seem to be male at first, the young eggs appearing therein a little later than the sperm cells. At a diameter of 7 mm. there are two gonads at the interradial, one at the adradial side of the bursa, all of them containing both male and female genital products. At this size young ones are found in the bursae; I have found no more than three young ones in a specimen, but of an extraordinary size, up to 2 mm. in diameter of disk. It is difficult to imagine how such large young ones can get out through the minute genital slits, only 0-5 mm. long. What a squeezing they must undergo, in spite of their rather large, compact scaling. It would seem difficult enough for an arm alone of the young one to come out through the small slit—but such a large disk, and five radiating arms! It always makes one wonder, seeing the young ones in the bursae of viviparous Ophiurids so jammed to- gether and distorted, how they can get clear of each other and assume normal radiate form. But the present case certainly seems to represent the climax of birth-difficulties
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